Mundanefan's manga / #shounen ai(105)

About an orphan who can't stop helping people who are in need, he starts interacting more and more with the guy in his class who everybody avoids. They also end up needing to work on a school project together, one day while the uke/orphan is at seme's house, his orphanage gets mass murdered by a serial killer, and on his way home smth happens to him which leads to him forgetting the events that happened before including the seme and he moves away from that area. He later comes back and starts working for the seme. Hella good webtoon so underrated more people should read it!