Family --

Ijin Yu has settled in with his life in high school and still interns with SW corps. However, when remnants of his past come back to take revenge on him, a boy suddenly dives to protect him at all costs for no apparent reason. The boy sustains heavy injuries and admist the confusion to thank his savior, Ijin's mysterious helper vanishes. The next day, he finds the boy to be attending his school and his class nonetheless.

-- This fanfiction is based of the manhwa known as Teenage Mercenary on webtoon, or in other cases, Mercenary Enrollment. I do not own this manhwa or any of it's characters.
-- I do not write traditional reader inserts where the reader's character has interchangeable features. For example: (f/f), (f/c), etc.