Kwon Som has always felt a strange nausea in his stomach whenever he sees him, a feeling that dates back to his childhood. In a similar but different way, the other two tend to fight whenever they make eye contact. After their parents remarried and formed a new family, they made rules.Rule 1. Going to and from school togetherRule 2. Hug each other for 30 seconds before coming homeWe have time to hug each other. At the suggestion of provocation, the two start kissing periodically. "Then I'll do it? I definitely gave you a chance to avoid it."