Yeon Hee-soo has three sexual partners.
Jung Ji-hyeok, who is honest as young as he is, selfish but charming Go Hae-seong, and Lee Soo-rim, who awakens the pleasure of being dominated.
To Yeon Hee-soo who hates dating but has good sex, they are like sweet candy.
Then one day, Yeon Hee-soo accidentally reunites with her teenage first love, Yoon Chae-gyeom.
"You're pretty. You're prettier when you smile. So keep smiling, Heesoo."