Castle is a cold, calculated crime-revenge webtoon where every step toward vengeance is a step away from the truth. The criminal syndicate known as Castle operates within the walls of the Castle Hotel in Gangnam, a shadowy organization of absolute ruthlessness. For Shin Kim, they are the source of all his nightmares: eight years ago, they murdered his father, and then they took the life of his mentor. Now, Shin isn't interested in forgiveness or justice he wants annihilation. To bring down a fortress, he knows he’ll need the right people, a specific set of killers each with their own grudge against the Castle. This is a noir-infused action manhwa built on tactical violence, the psychology of hatred, and the heavy cost of retribution. With its grounded mafia aesthetics and tightly wound plot, it's a must-read for fans of Mercenary Enrollment, Dokgo, and stories where revenge is a professional, brutal operation rather than a solo rampage.

Keywords: Castle webtoon, Gangnam crime revenge, Shin Kim Castle Hotel, mafia action manhwa, tactical vengeance story, organized crime Korean webtoon.

Meta Description: Shin Kim’s father and mentor were killed by the Castle syndicate; now he’s assembling a crew of ruthless allies to destroy their Gangnam fortress in this noir revenge webtoon.

Alternate Titles: Castle / 캐슬 / Castle: The Syndicate