'Kim Shin', a special killer who has sharpened his sword for revenge, and his life with 'Absolute Power' in the afterlife!
This manhwa tells the story of a killer that wants take revenge on the one that killed his father and teacher. Castle is the name of the 'organization' that killed his father and teacher. They are strong, some of them even stronger than our MC. *SPOILER (kinda)* - - - So, he 'collect' everyone who had the same goal as him and together they would bring down the Castle 'pillars'. If they managed to take down the pillars then it would be the same as destroying the Castle itself. The pillars are strong people (have money, power, and can fight well). On the MC side, there are only a few of them who are really strong. SPOILER END I will recommend this to someone who loves good action with a heavy plot.