This manhwa is so good, it delves into how an obsession can save a person, in this case the Hii-kun being obsessed with Kiyou, Kiyou being the self centered person that he is. In his own way was sheltering Hii-kun from being bullied extremely. In reversal Kiyou is saved by Hii-kun's brutal honesty and love. Especially when the whole world suddenly turned it's back into Kiyou. Hii-kun was the only one who stayed and comforted him.
In a psychological sense it's a give and take situation where they both heal each other's wound.
Utsukushii Kare