What happens when a hardened combat veteran, after a decade of surviving in war zones, suddenly finds himself back in high school? Meet Yu Ijin, the sole survivor of a plane crash who, from the tender age of ten, was forced to become a child mercenary. He trained rigorously and fought relentlessly, developing skills far beyond those of any ordinary teenager. Now, after years of a brutal existence, he has finally returned to South Korea, a country and a family he barely remembers. His new mission is not one of global conflict or life-or-death battles on a battlefield. Instead, Yu Ijin must navigate the treacherous waters of ordinary high school life, protecting his long-lost younger sister and his grandfather from the mundane yet equally insidious threats of bullies, social hierarchies, and everyday dangers. The transition from a world of bullets and bloodshed to textbooks and teenage drama is jarring, and keeping his lethal past a secret proves to be a constant struggle. The stakes are profoundly personal: securing a normal life for the family he never knew. Yu Ijin, known in the mercenary world as a formidable operative, is a stoic and highly capable protagonist whose honed combat instincts frequently clash with the expectation of blending in. He is a quiet guardian, a fish out of water trying to adapt while suppressing his true nature, making for a compelling story of action, drama, and school life. Fans can discover the unique premise of this exciting webtoon, also known by its alternative names Mercenary Enrollment, High School Mercenary, Iphak Yongbyeong, and 입학용병. For those eager to read Teenage Mercenary manga online, this series provides a captivating blend of intense action, emotional drama, and compelling character development. You can find Teenage Mercenary English scan versions readily available, allowing readers to dive into Ijins world. Stay updated with Teenage Mercenary latest chapters to follow Yu Ijins journey as he protects his family and attempts to find a semblance of normalcy in a world he was forced to leave behind.