Private detective Lu Chengfeng was entrusted by a mysterious woman to perform an undercover mission. He replaced the deceased Lu Songwen and became one of the five tigers in Tianhai City. In order to collect evidence of the powerful group and prevent more innocent people from being harmed, he resolutely accepted the mission and sneaked into the core of the group alone. He endured every step of the way and became the top undercover ace in Tianhai City who was dormant in the darkness.
