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I KNEW IT I KNEW THAT HE WAS GONNA LOCK HIM UP BECAUSE I WAS GETTING THE CHILLS
He didn't lock him up. On the surface, they have a normal relationship. Behind the scenes though, ML did accelerate MC isolating himself and he did a lot of things to make sure the MC fell in love with him.
This is for the second life. In the first one, he did keep him locked up and even shot his ankle when he tried to run away, which evidently failed to keep him in check since he managed to commit suicide lol
YES!!! The spoiler I needed
Most people have already spoiled it but in short, he actually is that guy and is just pretending he is not so this time around, they can be in a relationship.
The MC ended up killing himself the first time around and, to make sure they meet in the next life, ML made a deal with a shaman to tie their souls together even though MC's soul begged the shaman not to do it.
He orchestrated everything from their first meet in the new life, to MC having no friends, to him being kidnapped by a guy who looks similar to him and later on installed cameras everywhere in his house just to ensure everything goes as it should. Eventually, he dropped the crazy because MC started trusting him but the gist of it is that he will never let MC go away from him.
Their relationship at the end seems happy though and he actually treats him well this time around so... there's that.