Confused

i can’t remember names for the life of me but from what i’ve gathered our MC got drugged (possibly SA’d) by the white haired guy before the disbanding, seems to me like the white haired guy had some sort of obsession with our MC. ever since then our MC has lost all his emotions, hasn’t been able to sleep, can barley eat and can’t look at bright lights, all due to the side effects of the drug he was spiked with. the other happy and his sister (the owner of the club) have been searching for the same drug for years because some guy (maybe a brother) had something bad happen to him because of it, and then their dad disappeared. the other happy thinks it was his dad was who introduced the drug to korea when they moved back from brazil. the two of them along with the club owners lover (a doctor who has been treating MC knowing he was affected by the drug) have crated the perfect club environment for the drug to spread, that way they can get their hands on it/ the supplier. the white haired guy was out of the country for a while but came back and instantly started looking for our MC. the other members besides the guy with freckles know what happened when our MC got drugged and assaulted (not confirmed SA but there was definitely some other kind of assault that happened that left our MC traumatized by the white haired guy) our MC has been researching the drug on his own as well, other happy discovers this while staying the night. the reason MC is like that with other happy is due to the fact that the drug messes with dopamine hormones but only with things that the brain had already perceived as stimuli, but our MC is feeling all these new feelings of romance and lust towards the other happy that it causes his brain to short circuit if you will and be able to be calm with him or something (or so i understood idk im no doctor)