wait can someone explain

I'm guessing MC found his member Jun taking them and got upset so Jun said he could take it for him (the drug) but just ended up forcing MC to take them? Which effected his ability to be happy. Seeing as the Seungmin is from Brazil and the drug was made there I guess there's a possibility his dad got involved with the drug or something and is investigating it to get revenge or whatever idek and he finds out MC and dive ENT is involved too.