After a longtime gaslighting by a sex partner, Yeon-Su thinks of himself as a masochist. An elementary school swimming instructor, he starts teaching Cha Ju-Hwan, a top star who secretly needs to learn how to swim for filming. To Yeon-Su, who believed life was over and there was nothing to see at 29 years old, his world takes a 180º turn when Cha Ju-Hwan approaches him.

"I like to be hit, and my partner likes to make me this way."

"Then do it with me too."

(Source: Ridibooks)

Note: Chapter count includes ten side story chapters.