Choong-dong, a traffic officer who aspires to be a homicide detective, is recognized for his straight and honest nature and recruited into a case targeting gang leader Gwang-seop. Before long, he goes undercover as a member of Gwang-seop’s gang. Meanwhile, Joong-dae goes undercover in homicide to protect his boss Gwang-seop because he is the only member of the gang who graduated from university. Watch drama online for free.