Lin Mo is an undercover agent hiding in the darkness. Behind his cold and restrained shell is ruthless and decisive action. His goal is to destroy the mysterious organization that uses experiments on human nature for evil. During a mission, Lin Mo accidentally rescued Sang Yilin, who was targeted by the organization. In order to protect his identity, he had to take Sang Yilin with him. During the relationship, Lin Mo, who had never been harsh and talkative, actually fell in love with this delicate girl. While he had to deal with the suspicion of the organization and complete the undercover mission, he also tried his best to protect Sang Yilin and secretly gave her all his tenderness. Lin Mo walks on the tip of a knife, but holds up a safe sky for Sang Yilin. Sweet love and danger are intertwined. Can Lin Mo successfully complete the task, and can he keep this hard-won love?
