Okay, so this is obviously
Suprisingly the characters acknowledge this fact bc in these plots they never do for some reason. Dohyun has abandonment issues and probably an inferiority complex and (forgot name) recieved lashings from his dad for not living up to his standards
When his sister was born they switched all attention to her and essentially threw him away, further causing him to spiral into obsessing over Dohyun who hurt him (like his father) bc he thinks love includes pain too
Dohyun is jealous of his outer personality, his status of being wealthy and still using scholarship
I presume Dohyun doesn't have that much money as his mother is ashamed of him and didn't want to spend money on him hence asking for mcs place and why he hates him
By the end Dohyun regrets it as he sees mcs true colours and let's him go
MC isn't happy with this and finds Dohyun and uses same services he did to kidnap him, this time he doesn't plan to let him go at all.
BEING DELIVERED