One of South Korea's biggest corporations, Hwasae Inc. , is hosting a massive ball, and it's time to pull out all the stops. Velvet, gold embossed invitations, gift bags filled with thousands and thousands of dollars worth of diamonds, crystal-embedded masquerade masks- you name it, and it's part of this fancy party. The ball is the talk of the town - only select billionaires and celebrities are invited, and if you are lucky enough to attend, the party organizer will deliver your letter at the wildest of places like the shark tank in the COEX aquarium or abandoned down at the slums of Guryong. But all popularity and fame is accompanied by hatred and vengeance. Vengeance for life, childhood, and innocence. Shin Hoseok is hunting for an invitation... with the gory results of his mercilessness staining the streets of Gangnam-dong. He will stop at nothing as he thirsts for the blood of those who trained him, even if that includes spilling the blood of the innocent messenger.