Zhu Lei

Undercover within a drug trafficking syndicate, police officer Zhu Yangguang, nicknamed "Old Four", "protected" his drug trafficking accomplice Wu Hainiu, nicknamed "Little B", during a drug enforcement operation. Wu is a key figure within the drug trafficking group who holds the transaction relationships. Despite repeated drug crackdowns by the public security department, they have always been at a disadvantage as they have failed to break through this hidden network