He slipped on the road when he was making a delivery a while ago and hit his head and almost died. That's why he forgets things and his memory is a little fuzzy and he can't do deliveries anymore.
Thanks. What chapter was that?
I'm pretty sure it was this: http://www.mangago.zone/read-manga/warehouse/uu/warehouse-chapter-1/34/
he nearly died and lost parts of his memory i think
But according to the Q&A Dohyun just lives in the present and doesn't care about the past that's why he easily forget things
Does dohyun have some kind of mental illness? Why does he forget everything