300 years after the events of the Butterfly Lovers, in a town called Liang Zhu, Cho Yat-Chin after being saved by a mentor, becomes a constable. On his first day to report for duty, he solves a major case which leads Chief Constable Ching Ying-Hing to assign him to catch a murder suspect named Wan Tin-Bong. The case gets complex as more characters get involved.