This is one drama that you have to rewatch every year! That's what I do in fact. The drama deals with mental health so delicately which shows that even normal person have their own mental issue. Zo In-Sung's acting is 10/10 and Gong Hyo-Jin's performance is over the top! Her fiesty temper is so funny and she's so caring at the same time, her chemistry with Zo In-Sung is so lovely.. Jae-Yeol (In-Sung's character) dealing with his young illusion and getting beat up by his brother is just sooo sad. This drama is really a true gem! OST makes me happy :)