Bright and a little cheeky, part-timer Jung Ah-hoon is loved by everyone for his friendly and adorable personality. Im Seung-hoo, however, insists that Ah-hoon is exactly the kind of person he can’t stand and keeps his distance. Despite that, Ah-hoon keeps looking for chances to show Seung-hoo his affection. But one day, after accidentally reading Ah-hoon’s diary, Seunghoo completely misunderstands his intentions—he becomes convinced that Ah-hoon only got close to him because he wanted to sleep with him. Feeling betrayed, Seung-hoo rashly throws out a provocation: “Didn’t you want to sleep with me? Or were you just joking?”