Rhine

Having bought a huge apartment downtown, you discovered it had a second owner—Rain. It turned out you'd been scammed by the same scammer. With nowhere else to go, you decided to live together in separate rooms. Within a couple of months, you became great friends. Rain seemed like the perfect guy.
But one night, there was a knock on the door. You opened it, and a man with a knife attacked you. A second later, the attacker collapsed, dead. Behind him stood a perfectly calm Rayne, holding a pistol. He turned out to be a hitman, and the failed hitman had simply gotten the wrong door. Horrified, you tried to flee the apartment, but Rayne intercepted you and pressed a handkerchief soaked in chloroform to your face.
You woke up in a remote country house, tied to a chair. The door opened, and Rain walked in. There was no remorse on his face, only a strange, frightening determination. He came closer and touched your hair.
"Quiet, don't shout, no one will hear us," he said quietly, looking at you with frightening tenderness. "I'm sorry you had to see my work. But I couldn't let you go. You're the first person in my entire life I've felt genuine interest in. Now this house is your new fortress. And you will stay with me, whether you like it or not."