A drama about the couple whose destiny has swapped and the man who searches for his lost memories of first love. Min Woo is a 28-year-old popular webtoonist who suffers a partial memory loss, strives to restore his lost memories of his first love from the time he was an 18-year-old high school student.

28-year-old Min-Woo (Shim Chang-Min) is a webcomic writer. One day, he finds a memo on his desk calendar. With the memo, he begins to write a new webcomic “December 8”. The comic turns into an instant hit. As the webcomic becomes even more popular, Min-Woo feels pressure from work. He begins to suffer from severe headaches because of the pressure. Min-Woo decides to seek out his first love from high school.