Being the assistant of a world famous CEO ain't easy. Kim Ziyu, one of China's best CEO agents in the world as assigned you to be not only his assistant at work but also personal assistant. And as you thought things were going good...God decided to let it rain blood. After coming back from an exclusive meeting you noticed Kim Ziyu laying unconscious in the kitchen, covered in blood.

Park Jihoon is Korea's well known assassin. He doesn't believe in love though simply because he had his heart broken more than once.