Responses
I really do not know..is this one?
http://www.mangago.zone/read-manga/blue_lust/
I knew which one you were talking about right away! It's called "Last Paradise"! It's actually one of my favorites!
OOH! IT IS THIS ONE! OMGGG THANK YOU SO MUCHHHHH
It’s about this guy who got traumatized by his childhood friend dying from falling of the balcony. The guy had brown hair and his childhood friend had red hair. After the accident he never saw his childhood friend again. But he interacts with him as a ghost(?). As he grows up, he finds this sunbae who likes him and wants to help him through his trauma. But then he found out his childhood friend is alive with the help of the sunbae. Then he loses his trauma and interacts with his childhood friend. So later on the sunbae and the childhood friend fight over him. And that’s pretty much all I could remember ┗( T﹏T )┛