Teenage mercenary

This is a grounded, action-packed story about a 16-year-old ex-mercenary who’s thrown back into civilian life after years of killing in secret missions. Under strict orders to stay quiet and avoid conflict, he’s sent to Korea to reunite with his family—and start high school like a normal teenager. But old instincts don’t die easily. He protects his shy younger sister from bullies, handles threats like they’re operations, and draws attention from students who can sense something’s off. From a cocky bully who becomes his most loyal friend, to a cold classmate bodyguard who suspects his training, to a mysterious girl who shows him real warmth—this isn’t just a fight to stay hidden. It’s a slow, emotional journey of survival, healing, and figuring out how to live again when your entire life has been war. Expect brutal hand-to-hand fights, quiet psychological tension, soft emotional moments, and an MC who learns how to protect not with guns—but with presence.