Two twin brothers. Two opposite lives. In a world where loyalties are tested, alliances crumble, and moral ambiguities plague every decision, an elite HID agent discards his identity, becoming his twin brother - the boss of a major syndicate in Seoul. Gear up and step into the boots of Agent Baek and explore the twists in his gripping tale of blood and vengeance. (Source: WEBTOON)

It all started with a retirement. A legend in the underworld of killers and assassins, Sihyeok Cha, otherwise known as “The Red Shirt,” leaves a life of violence behind for his loving wife Miju and their unborn child. Little did he expect, however, that bonds made in blood cannot be so easily erased. When tragedy strikes, Sihyeok is dragged back into the deadly struggle between mob factions… and the fight is far from over. (Source: WEBTOON)