Selected from the fish cake movie 20 Years Old, the story of Cha Ji-ho (played by Kim Woo-bin) returns to his 20s.
A girl named Ma Ji-wook, a web cartoonist, is transferred to Cha Zhihao's class. What stories will happen between her and Cha Zhihao? Soon after, another handsome boy from the swimming club transfers to their class. What interesting collision will he have with Cha Zhihao, who lives by breathing and women? What will be the changes with the addition of Dongyu, Kyungjae, Sohee and others?
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