Symbiotic Relationship Between the Sun and the Moon
Is it Night Song?
Fever?
I think MC wanted to be a writer if I remember correctly. Also, he also kinda taught ML how to read because he can't read unfortunately.
Okay I just found it. It's Night Maze. Maybe I could have been wrong with my description. Anyway, been on my mind for weeks now and finally the search is over
Lf a manhwa all about ghost and yin and yang energy. MC has this yin energy where ghosts really likes so he can barely sleep and with the appearance of ML, which has yang energy, mc can finally sleep peacefully for once. Family knows about the condition of MC so he's in a secluded part of the house