Castle 2: Maninjisang

Shin Kim is a special killer who gathered men from all over the country and made the organization "Baek-Yi" to destroy the absolute power "'Castle" of the underworld. Through a negotiation, he got inside Castle and started working with the enemy... Will Shin be able to take down Castle and complete his revenge as he hoped?

(Source: Naver, translated)

Note: Includes two extra chapters.