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Every 100 days, Gunjun breaks up with his boyfriend because he's disappointed in their relationship. However, there is one belief that he holds fast to, and that is that every relationship has stages! "The way I see it, you go from 1 to 10, and when you reach 100 days, you have a relationship!" The opposite of this is Jung-seok, a long-haired senior who seems very light-hearted but is well-liked by people. After getting to know him, Geon-joon simply defines him as an "asshole senior" Meanwhile, after 100 days with his boyfriend, Gun-joon is half sad, half excited, and ends up breaking up with him for the same reason. Feeling sorry for himself, Gun-joon has a one-night stand, and the alcohol breaks him down with an unfamiliar pain he's never felt before. He comes face to face with a smirking man who asks if my dick is small too.... "Wait, is he...?"

A car accident leaves both Taekin, a high school outcast, and Heechan, a business owner, in the hospital. But Heechan has no time to sit around and enjoy his hospital bed. If he doesn’t get up and make sure his clients get their products, his business will be in jeopardy! There’s just one problem. After the accident, he now inhabits the body of this high school kid every day from 7 a.m. to 7 p.m. Talk about an out of body experience! Heechan decides that the way to fix things is to go to Taekin’s high school in the boy’s body and sort things out himself! While looking for the source of their transformation, Heechan sees a familiar face from his own past. But who is going to believe this ridiculous scenario and help him out? Just how is Heechan going to get his body back?!