Twinkling Watermelon

I'm from a world you can't even imagine. (1x4)

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Eun-gyeol encounters Se-gyeong in her teens and learns a few things about her life that don't make sense in the future. Meanwhile, I-chan meets Chung-a for the first time, but she doesn't say a word. I-chan tries to get away from Eun-gyeol, but Eun-gyeol follows him to the Snail Guesthouse and ends up becoming I-chan's math tutor.