Ning was the center of the class but now she's in crisis because of a random prank. And her friendship with Yun is now at stake.

In those boring little games, from guessing names to this-or-that, from competing to see who laughs first to the things we say to each other, many moments reveal our familiarity and deep bond. But what he didn't expect was that, at the end of the games, there would be no next time.

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