What’s Going On?

Yipeul and Dawoon have been friends since their school days, and their friendship is reignited when Yipeul returns from his military service. To commemorate his return, Dawoon plans a surprise for him by hiding in his closet with a birthday cake one night. However, the tables turn when Yipeul comes home, removes his pants, and begins masturbating while calling out her name. Will this incident change their relationship from friends to something more, or will they be able to maintain their friendship?