Joo Hong Bin, the CEO of a game company, has got everything. He is capable, rich and even good-looking. However, this perfect guy lacks in one thing. He is so ill-tempered. The worst guy on the planet. One day, this supercilious guy turns into a monster. When it rains, he becomes furious and some blades are coming out from his body. Se Dong, a woman with a bright personality and Chang, his first love's son appear making him confused.