Terms of Service

The Defense I Made to Play with Friends (Chinmandi; formerly Merge Heroes) · Effective October 18, 2026

This game is free to play, with some items (Diamonds and the Premium Pass) sold for real money. By signing up, you agree to these terms. The game is operated by Ildan Mandeum, a sole proprietorship in the Republic of Korea ("we", "us").

1. Accounts and eligibility

• Age requirement: The service is not directed to children under 13. You must be 13 or older to create an account. The English sign-up screen asks for your birth year and blocks sign-ups by anyone under 13. The birth year is used on your device and our server only to decide eligibility, and it is not stored. If we learn that an account belongs to a child under 13, we will delete it. Parents or guardians who believe a child has signed up can contact us at the support email on the support page.
• Minors: If you are under 18 (or the age of majority where you live), you need a parent's or guardian's permission to use the game, and especially to make purchases.
• You create an account with a nickname and password (or a Google or Apple account, or Kakao where offered). Creating several accounts to inflate rankings or rewards is prohibited.
• You are responsible for your password. If you forget it, we can issue a temporary password after verifying that you own the account. After receiving it, change it under My Info → Change Password in the game.
• Nicknames may not impersonate others or use offensive language. We may ask you to change a nickname, or change it ourselves, when we think it is necessary.
• You can delete your account at any time under My Info → Delete Account in the game (see Account deletion).

2. What is not allowed

• Running the game automatically with programs, scripts, or modified clients, or sending abnormal requests to our servers.
• Exploiting bugs to gain Gold, heroes, or records unfairly (if you find one, please report it via My Info → Contact Us).
• Harassing others, or posting profanity, hate speech, sexual content, ads, spam, or personal information (such as contact details) in chat, nicknames, Board posts and comments, or inquiries.
• Copying our servers, code, or data without permission, or posting them elsewhere.

If you violate these rules, we may delete your records or suspend or delete your account without warning.

Zero tolerance for offensive content and users: Profanity is masked automatically. You can report and block players with the flag button in the co-op chat window, and with the Report button on Board posts and comments. Board posts and comments reported by several players are hidden automatically before we review them. We review reports within 24 hours and may delete content, restrict chat and posting, change nicknames, or suspend accounts. Chat, Board posts, and comments from players you block are hidden, and friend requests and room invitations from them are blocked. You can unblock someone under My Info → Blocked List.

Board: Posts and comments on the Board are visible to other players, and authors can delete them at any time. Posting unlocks at account Lv3, up to 3 posts a day. Ideas posted in the Idea Lab may be used or reflected in the game, and you may not claim separate compensation for this. Rewards for adopted ideas (mail rewards and your name in the patch notes) are decided by us case by case and are not guaranteed.

3. In-game currency and items

• Gold, Diamonds, Summon Stones, Enhance Stones, Awakening Tickets, Unlock Tickets, Shards, heroes, and other in-game items can be used only inside the game and cannot be exchanged for cash.
• Diamonds can be bought with real money in the app (paid Diamonds) or earned through quests, passes, mail, check-in rewards, coupons, Gold exchange, and so on (free Diamonds). Paid Diamonds are the base amount of a Diamond product (including Diamonds given instead when you buy the Premium Pass while it is already active); purchase bonuses and first-purchase extras are free Diamonds. When you spend Diamonds, free Diamonds are used first. You can see your paid and free Diamond counts and history under Shop → Diamond Shop → Diamond History. Things bought with Diamonds cannot be reversed.
• Randomized items: The Hero Summon (which uses Summon Stones) is a randomized item whose result is decided by chance. What you can get, the odds, and the guarantee ("pity") are disclosed under Summon → View Odds in the game and on the odds page.
• Game rules, balance, and rewards may change without notice. Changed rules apply from the next match you start.
• We may adjust items or records to balance the game or fix bugs. When we do, we try to tell you by in-game mail or in the update notes.

4. Paid purchases, withdrawal, and refunds

• Purchases are made only through in-app purchases on Google Play or the App Store. Payment methods, receipts, and refund procedures follow each store's policies. Refund requests for App Store and Google Play purchases are handled through the store's own refund process.
• Monthly pass period: The monthly pass (Free, Gold, and Premium tracks) and monthly quests run on a 30-day cycle starting from each player's sign-up date (for players who signed up before November 1, 2026, the cycle starts on November 1, 2026; until October 31, 2026 it follows the calendar month). The Premium and Gold Passes apply until the end of the period you bought them for, and the period is shown on the pass screen and the purchase button. If you buy late, you can still claim the rewards for every level you have already reached in that period.
• Withdrawal: If you ask within 7 days of purchase and have not used any of the paid Diamonds you received, you may request a withdrawal (refund). If you have used some of them, or the product takes effect immediately (such as the Premium Pass, which unlocks that period's rewards right away), withdrawal may be restricted under Article 17(2) of the Korean Act on the Consumer Protection in Electronic Commerce. We tell you this on the purchase screen in advance. Korean consumer-protection law may apply to your purchase in addition to the store's rules, and nothing in these terms limits any mandatory consumer rights you have under the law that applies to you.
• If a minor makes a purchase without a legal guardian's consent, the minor or the guardian may cancel the purchase.
• If a store refunds or cancels a purchase, we take back the Diamonds (or the pass) received through it, starting with that purchase's paid Diamonds. If you have already spent them, your Diamond balance may go negative.
• You can request a refund from the store's refund page or via My Info → Contact Us in the game.
• If we shut down the service, we will give at least 30 days' notice and refund any unused paid Diamonds remaining at that time as required by applicable law. Free Diamonds are not refunded.

5. Operation of the service

• The game runs on cloud servers in Seoul, Republic of Korea (Amazon Web Services). Connections may drop without notice because of outages or maintenance, and we do not compensate for interrupted matches or lost progress caused by this.
• Server data is backed up daily, but an outage may cause up to about a day of recent progress to be lost.
• We may change or end the service when circumstances require. When we end it, we will try to announce it in advance by in-game mail or notice.

6. Personal information

The information we collect and how we handle it are described in the Privacy Policy.

7. Contact

The fastest way is My Info → Contact Us in the game. If you cannot log in, use the email address on the support page or the developer contact listed on the app store.

8. Governing law and disputes

These terms are governed by the laws of the Republic of Korea, and disputes are subject to the courts of the Republic of Korea, except where mandatory consumer-protection law in your country or state of residence gives you the right to bring a claim in another court or to have another law apply.

9. Changes to these terms

If these terms change, we will update the effective date on this page and announce important changes by in-game mail. If you keep using the game after a change, you agree to the changed terms.