Teenage Mercenary is an action manhwa that follows Ijin Yu, a teenager who survived a plane crash as a child and was raised as a mercenary in a war-torn region, returning to his family as a highly skilled soldier while trying to live a normal high school life. As he protects his family from threats while navigating the challenges of teenage life and dealing with his traumatic past, the narrative explores themes of family, trauma, and the contrast between his deadly skills and desire for normalcy with intense action and emotional depth. Blending action, military, school life, and drama elements with mercenary protagonist, the series delivers thrilling storytelling that appeals to fans of military action and school life dramas. Also known as Teenage Mercenary manhwa, 입학용병, Iphak Yongbyeong, Mercenary Enrollment, Ijin Yu, and Korean action webtoon.