Greetings, Rune Hunters.

To celebrate the 4th Anniversary,

we would like to sincerely thank all Rune Hunters who have shown their continued love and support for UNDECEMBER.

As a small token of our appreciation for your support,

we have prepared a special coupon.

We will continue to do our best to deliver even more enjoyable adventures for you.

Please refer to the details below.

◆ 4th Anniversary Coupon Event

■ Coupon Code: 4UDTHANKS

■ Coupon Validity Period

- January 15, 2026 (Thu) – February 5, 2026 (Thu) 23:59 (UTC+9)

■ How to Use

➡ Go to the Coupon Registration Page

1. Enter your game account information and coupon code on the coupon registration page, then click [Confirm].
2. Your Member Number can be found in-game via [Game Settings] > [Account].
3. Please claim the reward via in-game mail.

■ To Note

※ In-game mail will be stored for 3 days (72 hours).

┗ If not claimed within the time limit, the mail will expire and be deleted.

※ The coupon can be used once per account only.

┗ Rewards can be claimed in either Standard or Season Mode (one mode only).

※ Coupons cannot be used after the expiration date. Please check the validity period in this notice.

We hope you continue to enjoy your adventures with UNDECEMBER.

For more updates and discussions, feel free to visit our community anytime!

Thank you.