Ooooo every other f-ed up manga vibes ooooo
Or nmaybe the killer brought him in so that he can forge "evidence" that the mc killed the boyfriend himself, or that at least he was the last with him right before he died... and then blackmail him or threaten him to keep him under his control... The collar that this killer makes him wear in the cover makes me think that controlling him is exactly what he wants.
Sorry, I meant the handcuffs (not a collar)
Ooo I see where you going with this!! I can’t wait till the next chapter o(≧▽≦)o
Why i got feeling that the seme is gonna pressure the mc to kill the ex?(￣∇￣")