Siwoon, who dislikes the thought of dating people is only looking for a casual sex partner. One night while he's going to meet up with his friends, he encounters Heewon, a junior, who has good looks, a nice looking body and is super tall, says to him,

  

  

The iron wall Siwoon built around himself is useless against Heewon, who approaches without stopping. Siwoon accepts the way Heewon keeps invading his territory, pretending he can't help it.