In order to cut off the drug trafficking network in South Korea, police chief Min Hung kee (played by Sun Chang min) established a special search department. Prosecutor Chi Hengmin (played by Li Zaiyun) serves as the leader of the Special Investigation Department to avenge his brother, specializing in capturing drug lords. Nicknamed "Doctor's Son", Zheng Shixian (played by Zheng Jinghao) comes from a lonely background and grows up with excellence
In order to cut off the drug trafficking network in South Korea, police chief Min Hung kee (played by Sun Chang min) established a special search department. Prosecutor Chi Hengmin (played by Li Zaiyun) serves as the leader of the Special Investigation Department to avenge his brother, specializing in capturing drug lords. Nicknamed "Doctor's Son", Zheng Shixian (played by Zheng Jinghao) comes from a lonely background and grows up with excellence