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The encyclopedia · Advertising & PR · Marketing decision · 2025

Webzen's MU Archangel gacha made rare drops 0% until the 51st draw — KFTC fined it

MU Archangel's hidden 'floor system' kept rare-item odds at zero until draw 51–150, while the game showed a normal rate. The KFTC fined Webzen 158 million won.

Webzen

What happened

Webzen's mobile MMORPG MU Archangel sold three gacha draw tickets — the Set Treasure Draw, the Festival Roulette Draw and Jiryoung's Treasure Draw — each with a disclosed draw probability. The rates were not what they seemed: a hidden 'floor system' kept the rare component odds at zero until a player had drawn 51 to 150 times, whereupon they rose to the level the game publicly advertised.

The deception surfaced in March 2024, when players noticed their pulls never matched the stated rates. Webzen apologised, said it had 'discovered an error in how probabilities were displayed', and offered refunds. But the KFTC ruled the refunds were far from complete: of 20,226 affected users, only 860 — under 5% — received compensation.

On 30 November 2025 the KFTC issued a corrective order (a prohibition on future violations plus a reporting order on preventive measures) and fined Webzen 158 million won, about US$107,000. The regulator stressed that players had bought the tickets believing they could draw rare items from the very first pull. The fine drew criticism from the industry as modest against Webzen's revenue scale.

Why it happened

  • The rate card and the algorithm were two different products: the disclosed probability described draws 51–150 in, while players actually got zero until the floor — the advertised number was a fiction.
  • The apology was a settlement, not a fix: calling a deliberate mechanism an 'error in how probabilities were displayed' let Webzen refund a sliver of users while mischaracterising a designed system.
  • Disclosure rules only work when the number is honest: Korea's regime assumes the stated rate is the real rate, and a hidden floor hid the gap disclosure was meant to close.
What it cost158 million won (~US$107k) fine; corrective ordercostly

The lesson

A disclosed probability is a promise. If the real odds stay zero until a hidden floor passes, the published rate is a lie — and what the player cannot see is what the regulator judges.

Sources

spotted an error? The club wants to know.

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