Castle 2: Pinnacle

Castle 2: Pinnacle is a Manga/Manhwa/Manhua in (English/Raw) language, THRILLER
series, english chapters have been translated and you can read them here. You are reading chapters on kissmanga.in fastest updating comic site. The Summary is

Kim Shin, 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 the Castle and started working with the enemy… Will Kim Shin be able to take down the Castle and complete his revenge as he hoped.