Pretty Crazy

After quitting his job, Gil Gu (Ahn Bo Hyun) lives a lonely, aimless life until aspiring pâtissier Jung Seon Ji (Lim Yoona) moves in to the same apartment building with her family. Seon Ji is beautiful and sweet, causing Gil Gu to fall in love at first sight. However, when he runs into Seon Ji at night, she's aggressive and terrifying, like a completely different person. Gil Gu soon learns from Seon Ji's father Sang Su (Sung Dong Il) that for her entire life, Seon Ji turns into a demon every night – and she has no idea that it's even happening. Recently injured and at his wit's end, Sang Su asks Gil Gu to watch over Seon Ji at night. Gil Gu agrees, oddly fascinated by Seon Ji's condition and secretly hoping that it might bring them closer together. Can Gil Gu find a way to help Seon Ji out?