Ji Xiu, a young killer who is well-known in the Tao, begins to be responsible for protecting Gu Fan, the future head of the black and white Tao. Ji Xiu is a young man with a sensitive mind and extraordinary skills. Gu Fan, the son-in-law, has an inexplicable affection for him since he first saw this beautiful and somewhat excessive child.
As the two became more and more familiar with each other, Ji Xiu gradually began to feel that Gu Fan was a very important person to him. He tried his best to protect him, even though he would be hurt, misunderstood, and even put himself on the verge of death, just to keep him safe.
When the one-year protection period has passed, where should the two of them go? Should they try their best to protect their love, or should they leave and never see each other again?