"Why am I naked in bed with another man…?" Jaewoo reluctantly attends his high school reunion and he can't wait to leave. But after seeing someone he thought he'd never meet again, he ends up drinking himself into a stupor. The next day, Jaewoo wakes up next to Siyeon, the boy who was pining after him throughout high school. This is Siyeon's chance to pounce! He offers Jaewoo a deal, one month of dating, after which things can end amicably, no questions asked. But as rumors start spreading about the circumstances surrounding the reunion, Jaewoo starts becoming suspicious of Siyeon's true intentions…