The Doll Maker's Captive Taekook

Taehyung is a mad scientist who does experiments on people like
turning someone into a living doll and selling them to rich people. He's
been watching Jungkook for a month because he is the perfect person to do experiments on. At first it's just business but Taehyung becomes infatuated with him and falls for him and does an experiment on Koo to make him fall for him.