Choi Dong-goo

Detective Ma Seok-do changes his affiliation from the Geumcheon Police Station to the Metropolitan Investigation Team, in order to eradicate Japanese gangsters who enter Korea to commit heinous crimes.

Tragedy, betrayal and a mysterious discovery fuel a woman's vengeance for the loss of her tribe and family.

Hyeon-joon, who transferred to Gwangsanggo, meets Jin-won, Byeong-yeon, and Yeong-soo, who are armed with a knuckle, and forms to be the fourth musketeer. As the Four Musketeers continued their fearless moves, the rest of them showed up one by one. Face it! The unprecedented and ignorant youth tournament begins!