After the gold medal killer Xiao Haochen (Qian Shou) avenged his father, he evaded pursuit and hid in a bar called "Previous Life" in Lianzhou City.
Because of his sister Xiao Xiaoyu, he got acquainted with Di Yan (Qiang Gong), the leader and domineering president of the assassin organization in the underground kingdom. From then on, the story of love and hatred between the two began.