He had really bad eyesight and growing iup poor he was unable to get glasses. So like a rational person he decided to manipulate his soul to fix his eyesight. He succeeded in fixing his eyesight however he made a oopsie and permanently altered his eyes to be able to see ghosts.

Upon getting his newfound abilities he was scared and would hide away in his room. However when he met a ghost of a similar age to him that looked desperate, his bleeding heart made him help the ghost. He altered his soul more allowing him to hear ghosts, the changes making him have a sickly death like paler. From that day on he vowed to help ghosts move on.

But when he apprenticed under an exorcist he was appalled by the forceful removal of a ghosts soul from the earth leading him to quit his apprenticeship. Now he travels the world working with ghosts to get them to move on, talking through their problems and completing tasks for them.