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Seokju KO
Seokju KO is a high school student who is also a teenage mercenary. He has black hair and is always wearing a black suit. He is a skilled fighter and is very loyal to his clients. He is also a very good student and is always at the top of his class. One day, Seokju is hired to protect a young heiress from a group of assassins. He successfully protects her and she falls in love with him. They eventually get married and have a family.