When eight-year-old Yu Ijin walked away from a plane crash that killed everyone else, he had two choices: die or become a monster. He became a mercenary. Ten years of blood, gunfire, and hand-to-hand slaughter turned him into a living weapon. Then South Korean soldiers found him, and he learned he still had family a little sister and a grandfather waiting at home. Now he’s supposed to go to high school, make friends, and act normal. But old enemies crawl out of the shadows, and Ijin realizes you can’t outrun a past soaked in blood. The action is brutal, the emotional beats hit hard, and watching a killing machine try to pass math class is surprisingly touching. For fans of God of Blackfield or Weak Hero.

Keywords: Teenage Mercenary manhwa, mercenary enrollment, Yu Ijin, high school action webtoon, combat prodigy, family protection story

Meta Description: A child mercenary returns to South Korea after ten years to live as a normal student but his deadly past refuses to let him go.

Alternative Names: Mercenary Enrollment / High School Mercenary / 입학용병 / Iphak Yongbyeong / Teenage Mercenary