Union Arena Solo Leveling Mill Deck Guide: Jinwoo/Cha (2026)

TL;DR: The Purple Jinwoo/Cha mill deck uses UE17BT/SLG-1-016, UE17BT/SLG-1-017, Esil, Han Song-yi, and I Want to Catch Up to Him to fill your sideline. At 20 cards, Demon's Castle turns the resource into a repeatable Elixir of Life line. Five-cost Sung Jinwoo and Cha Hae-in then turn that setup into pressure. It is a different deck from Purple Shadow Army, and its historic Virginia win is more secure than its current tier label.

Updated October 21, 2026: we checked every number against Bandai's card text and added where the deck stands now (five Jinwoo/Cha lists among 68 recent Sung Jinwoo results), Joseph Writer Anderson's Rare Battle report with his video, and a player's take on mill versus Shadow Army. Two fixes: the 5-cost Sung Jinwoo's retrieval range starts at 2000 BP, and Bandai's archive dates are the days results were posted. Bandai's November 1 limit on Monarch's Domain doesn't touch this list.

Union Arena Solo Leveling Mill Deck Guide: Quick Answer

The list in this guide is the 50-card Purple Cha/Jinwoo Mill deck identified by Joseph Writer Anderson as the first-place deck from the Virginia Regionals 26-27, piloted by Nick. Bandai's official top-placing archive shows Purple Solo Leveling winning Wave 1 regionals as well, starting with results posted on May 8, though it doesn't say which Purple build those were. Either way, the archetype has a real tournament win behind it, not just a community label.

The deck's printed mechanics explain why the list earned that result. UE17BT/SLG-1-016 Sung Jinwoo places the top two cards of your deck into your sideline. UE17BT/SLG-1-020 and UE17BT/SLG-1-021 become larger for every five cards in the sideline, and UE17BT/SLG-1-011 Cha Hae-in can enter play from the sideline with fulfilled energy. The deck is trying to make the sideline count matter every turn.

Key Takeaways

• The community name is mill, but the official card text is mostly self-mill into your own sideline.
• The 10-card threshold turns on extra value for Han Song-yi and Cha Hae-in, while Demon’s Castle requires 20 cards.
• The 5-cost Sung Jinwoo is the main closer: it can Raid, force blocks after winning an attack, grow with the sideline, and retrieve a small Character from the sideline.
• Cha Hae-in is the best free-play target because Sung Jinwoo can bring it back active when the required condition is met.
• Esil and Han Song-yi make the sideline a usable hand extension rather than a one-way discard pile.
• Mutilation gives the deck a clean answer to an opposing front-line Character, with a higher BP ceiling when Sung Jinwoo is in play.
• The Virginia win is confirmed history. The exact current tier label is not confirmed, so test the list against the current room instead of importing an old ranking.

Why This Mill Build Is Different From Shadow Army

The existing Purple Shadow Army guide is about building a wide board of Shadow Army Characters and using free plays to snowball pressure. This build is narrower and stranger. It wants certain cards in the sideline, not necessarily on the field, because Sung Jinwoo, Cha Hae-in, Elixir of Life, and Demon’s Castle all become better once that zone is full.

That distinction matters when you mulligan. A Shadow Army hand can prioritize early bodies and affinity density. The Jinwoo/Cha list wants a path to the 10-card and 20-card sideline thresholds while keeping at least one meaningful Character in hand for the next Raid. If you fill the sideline without a way to retrieve value from it, you have milled yourself without building an engine.

GODEEPER: If you want the aggressive alternative first, the Union Arena Solo Leveling Guide: Best Cards and Decks → covers Shadow Army and the wider UE17BT card pool.

The 50-Card Purple Jinwoo/Cha Mill List

This is the public Virginia list attributed to Nick in Joseph Writer Anderson's regional breakdown. The list is a tested tournament recipe, not a claim that every local build must use these exact counts.

Bandai limits Monarch's Domain (UE17BT/SLG-1-035) to two copies per deck from November 1, 2026. This list plays no Monarch's Domain, so nothing in it changes; the restriction hits the Shadow Army build, which the Solo Leveling guide linked above covers.

There is no separate Leader row in the public list because Union Arena uses the deck's Character and Event recipe format for this archetype. The 50-card package is the important part to preserve while you test. If you change counts, change one threshold at a time so you can tell whether the sideline is filling too slowly or your payoff cards are arriving too late.

The Union Arena Solo Leveling Mill Deck Engine

UE17BT/SLG-1-016 Sung Jinwoo is the first card to understand. It stops the opposing Character it battles from using Impact for that battle, then places the top two cards of your deck into your sideline. That is not flashy removal, but it advances the exact resource the rest of the deck measures.

UE17BT/SLG-1-017 Sung Jinwoo does the same job from a different angle. When you have no cards on your field, its required energy is reduced while it is in hand. Its When Played effect looks at the top card of your deck and either leaves it on top or sends it to the sideline. That makes it a useful early stabilizer and a clean way to decide whether the next card belongs in the engine.

UE17BT/SLG-1-002 Han Song-yi gives you the choice this deck wants most: draw a card, then place a card from hand into the sideline, or buff another Character during your turn. UE17BT/SLG-1-003 Han Song-yi rewards being returned from the sideline by an ability, gives energy generation at 10 or more cards, and lets you decide whether the top card stays on the deck or joins the sideline.

Esil is the bridge between self-mill and hand quality. When UE17BT/SLG-1-008 Esil is added from the sideline by one of your abilities, it draws one, places one card from hand into the sideline, and looks at the top four cards for Sung Jinwoo or Demon's Castle. If it finds one, another card from hand goes into the sideline. Esil is more than a body. It is a way to keep the deck moving after the sideline has started filling.

Image: official Union Arena card images (Bandai), Sung Jinwoo UE17BT/SLG-1-017 and UE17BT/SLG-1-020. The early Sung Jinwoo builds the sideline; the Raid version turns that count into power.

Reaching 20 Cards Without Losing the Game

The first milestone is 10 cards. Cha Hae-in's UE17BT/SLG-1-011 text becomes much more threatening there: if it has been added from the sideline by an ability, Sung Jinwoo can bring it in active, and at 10 or more cards it cannot be blocked by a Character with 4000 or more BP. Cha also puts the top card of your deck into the sideline, so the payoff piece continues the engine instead of ending it.

The second milestone is 20 cards. UE17BT/SLG-1-034 Demon's Castle plays as a Site and puts the top card of your deck into your sideline. It can only activate once you have 20 or more cards there, but when it does, it pays the AP cost for UE17BT/SLG-1-037 Elixir of Life from the sideline and moves the used card to the removal area. Elixir of Life returns a Character with 4000 or less base BP from the sideline and draws a card.

That loop is why you should not rush every card into the sideline. Demon’s Castle is strongest when the zone contains a useful Character rather than twenty anonymous cards. Put low-impact cards there early, keep a payoff or a way to find one in hand, then use the 20-card threshold to convert the zone into real board presence.

Image: official Union Arena card images (Bandai), Demon's Castle UE17BT/SLG-1-034 and Mutilation UE17BT/SLG-1-040.

Step-by-Step: How to Pilot the Solo Leveling Mill Deck

1. Mulligan for a sideline route. Keep UE17BT/SLG-1-002 Han Song-yi, UE17BT/SLG-1-016 Sung Jinwoo, UE17BT/SLG-1-017 Sung Jinwoo, or I Want to Catch Up to Him. A hand full of late Raid cards without a way to fill the sideline is not a keep.

2. Use the first turns to establish the zone, not to imitate Shadow Army. Place cards from the top of the deck or your hand into the sideline when the effect is profitable. The goal is to reach 10 cards with enough hand quality left to start the Raid line.

3. Treat Esil as a reload button. Do not spend Esil only as an early body if you can reasonably return it from the sideline later. Its draw, hand-to-sideline, and top-four search effects are the pieces that keep self-mill from becoming self-disadvantage.

4. Reach the Cha Hae-in breakpoint before forcing the big attack. At 10 or more sideline cards, Cha Hae-in can enter active through a Sung Jinwoo ability and attack through larger blockers. That creates the pressure window that lets you spend the opponent's removal before the 20-card engine comes online.

5. Use Demon’s Castle after the sideline contains a target worth retrieving. The Site is not a reason to blind-mill faster. At 20 cards, use it to access Elixir of Life, turn that into a Character, and keep AP for the action that actually changes the board.

6. Close with the 5-cost Sung Jinwoo, not with an empty deck. UE17BT/SLG-1-021 Sung Jinwoo grows for every five sideline cards, and when it attacks and wins it can add a small Character from the sideline to your hand. It also gains the forced-block line for the turn. Use the mill count to make attacks unavoidable, then let the opponent's hand and board collapse under the pressure.

Mulligan Priorities and Common Mistakes

The best opening hand usually has one low-cost self-mill card, one way to find or recycle a Sung Jinwoo, and one payoff you can leave in hand. Do not throw back every hand without Cha Hae-in. You have four copies in the sample list, and the early game is more about reaching the threshold than drawing the exact finisher immediately.

The most common mistake is placing every card into the sideline without tracking what the 5-cost Sung Jinwoo can retrieve. When he attacks and wins, he can return a Character with 2000 BP or less, and that range grows by 500 for every five cards in your sideline. Keep that retrieval line in mind before you trade away a small Character for one more card of self-mill.

The second mistake is firing Mutilation before Sung Jinwoo is in play when you could wait one turn. UE17BT/SLG-1-040 Mutilation sidelines an opposing front-line Character at 3000 BP or less, or 5000 BP or less if Sung Jinwoo is on your field. That extra ceiling is often the difference between spending a second card on removal and opening a clean Raid attack.

The third mistake is treating the deck as passive. You are not trying to sit behind twenty sideline cards forever. Once Cha Hae-in can enter active and the 5-cost Sung Jinwoo can force blocks, attack. The sideline is a pressure engine, not a reason to pass turns.

What the Virginia Win Proves, and What It Doesn't

Joseph Writer Anderson's April 20 event breakdown labels Purple Cha/Jinwoo Mill as the first-place Virginia Regionals 26-27 deck piloted by Nick. His deck list and commentary are the clearest source for the specific 50-card recipe. Bandai's official top-placing archive is a separate check on Purple Solo Leveling as a whole: it shows first places in results posted May 8, June 12 and June 26 (Wave 1), then August 21 and September 18 (Wave 2), but it doesn't split mill from Shadow Army.

Recent public lists say where mill sits now. We counted the 68 Sung Jinwoo tournament lists on unionarenadecklists from September 2 to October 11: five are Jinwoo/Cha mill (Demon's Castle plus Cha Hae-in), the latest from September 20, and all five come from local events. Nearly everything else is Shadow Army. That makes the archetype proven, not dominant, and Bandai doesn't publish win rates that would say more.

GODEEPER: The cross-IP Union Arena current meta snapshot explains why one result should be read as evidence of a deck's ceiling, not as proof that it still dominates today's field.

How the Deck Plays Into Shadow Army

Joseph Writer Anderson took his own Purple Jinwoo/Cha build to a Solo Leveling Rare Battle in June and finished second, against Shadow Army in all three rounds. His version leaned aggressive, with 14 zero-cost or near-zero-cost characters, to "get plenty of attacks through early on before Shadow Army builds up to its full strength." That won his first two rounds. In the final he kept a slow hand, never drew Demon's Castle, and lost a long game once his opponent landed the 12-cost Jinwoo.

Players see the same trade-off. In an r/Union_Arena_TCG thread on the best Solo Leveling deck, one player wrote: "In my experience, the mill deck has a higher ceiling but can take a while to get there. Shadow Army, while not having the same top end as mill has a higher floor and is more consistent."

Our take

Build Jinwoo/Cha mill if you like counting your sideline and want a deck most Shadow Army players don't practice against. Don't build it expecting regional results: the recent public lists are locals, and Shadow Army keeps winning the big events. If you do play it, take the lesson from Anderson's final and mulligan slow hands. The deck can't afford to give Shadow Army the long game.

Related Reading

• Union Arena EN Meta Tier List 2026: the earlier tier snapshot that records the Virginia result and its current caveat.
• Union Arena TCG Beginner Guide 2026: rules, zones, and starter-deck context before learning a threshold-heavy build.
• Union Arena Bleach Ichigo Deck Guide: another guide with a real mill-to-removal engine, useful for comparing resource-zone pacing.

Frequently Asked Questions

What is the Union Arena Solo Leveling mill deck? It is the Purple Sung Jinwoo and Cha Hae-in build from UE17BT. It fills your sideline through self-mill and hand-to-sideline effects, then turns that resource into Raid turns, forced blocks, Impact, and value. The printed engine mills your own deck, not the opponent's, even though players call the strategy a mill deck.

Is the Solo Leveling mill deck the same as Purple Shadow Army? No. Shadow Army is summon-focused, while this list prioritizes sideline thresholds, recursion, and a slower Raid plan. Both are Purple Solo Leveling decks, but they ask for different mulligans and closing turns. The mill label should not make you mulligan for the Shadow Army game plan.

How many cards should be in the sideline before the mill deck turns on? The key threshold is 20 cards in the sideline for Demon's Castle. Several other cards become better at 10 or 20 cards, so the first objective is to fill the sideline without losing the Characters and Events needed for the closing turn.

What are the core Solo Leveling mill cards? The tested Virginia list uses Han Song-yi, Esil, several Sung Jinwoo cards, Cha Hae-in, Demon's Castle, I Want to Catch Up to Him, Elixir of Life, Arise, and Mutilation. The 5-cost Sung Jinwoo and 4-cost Cha Hae-in are the central Raid and free-play payoff pair.

Did the Union Arena Solo Leveling mill deck win a real event? Yes. Joseph Writer Anderson's event breakdown identifies Purple Cha/Jinwoo Mill as Nick's first-place Virginia Regionals 26-27 deck. Bandai's official archive also shows Purple Solo Leveling winning Wave 1 regionals, starting with results it posted on May 8, but it doesn't say which Purple build won or who piloted it.

Is the Solo Leveling mill deck still top tier today? Not on current results. Of the 68 public Sung Jinwoo tournament lists from September 2 to October 11 on unionarenadecklists, five are Jinwoo/Cha mill, all from local events, while all eight regional lists in that span are Shadow Army. Treat mill as a proven deck that's now a local-level pick, not the format's best deck.

Correction, October 21, 2026: an earlier version said the 5-cost Sung Jinwoo returns a Character with 2000 BP or less "at the first breakpoint." His base range is 2000 BP and grows by 500 per five sideline cards. We also called Bandai's archive dates event dates; they're the dates results were posted. The "still top tier" answer used to say the deck's current position wasn't confirmed; it now reflects the September to October results.

References

• Union Arena official Solo Leveling card list: Bandai's live UE17BT card database and card-detail links.
• Sung Jinwoo UE17BT/SLG-1-049 official card detail: official card-detail format and text reference for the set.
• Union Arena official top-placing decks archive: Bandai's event results for Purple Solo Leveling across Wave 1 and Wave 2.
• 6 Top UNION ARENA Decks from the Virginia Regionals, Joseph Writer Anderson: Virginia placement, pilot attribution, and the exact 50-card recipe.
• UNION ARENA: Every Solo Leveling Deck, Ranked, Joseph Writer Anderson: independent explanation of the Purple Jinwoo/Cha strategy and its self-mill potential.
• How I Topped My First Solo Leveling UNION ARENA Rare Battle, Joseph Writer Anderson: a second-place Rare Battle report with the deck against Shadow Army.
• Sung Jinwoo tournament lists, unionarenadecklists: public lists used for the September to October count.
• Union Arena restricted cards, Bandai: the Monarch's Domain limit from November 1, 2026.