Min-woo is a 28-year-old introverted writer of webcomics (or "webtoon") who has partial memory loss.One day, he finds a memo on his desk calendar, and because of it, writes a new webtoon titled December 8, which becomes an instant hit. But as the webtoon gets even more popular, Min-woo feels pressure from work and begins to suffer from severe headaches. He strives to recover his lost memories from the time he was an 18-year-old high school student, especially those of his first love, Mimi, as he unravels their mysterious fate.

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