He is a man who kills people like hemp and treats others like a piece of grass. He is also a person who is invulnerable to all poisons. His hands can kill, his feet can kill, every part of his body can kill, even a drop of his blood can kill many people. Unless he seeks death himself, almost no one in this world can kill him. However, a person like him fell in love with a kind-hearted miracle doctor. The first time, she saved him, and he promised to owe her his life; but she never came to him. The second time, she saved the person he wanted to kill. For the first time in his life, he let someone escape alive from his knife. He fell in love with her, but his love brought her death. For the first time in his life, he tasted despair. Then, he did something he had never thought of in his life...