Kwon Som had a strange feeling of nausea whenever she saw Gun since she was little. The two, who are similar but different, would fight whenever they made eye contact, and when their parents remarried and they became one family, they created rules. Rule 1. Go to and from school together. Rule 2. Hug each other for 30 seconds before coming home. That's how they forced themselves to hug each other, and at Gun's provocation, the two started kissing periodically... "Then you'll do it? I definitely gave you a chance to avoid it."