Well actually turns out I haven't read the same novel, but a similar one with the same premise, but even more dark. Its called "Turns out I'm crazy" , and it's on novelupdates. The guy is even more of a jerk there and literally ruined his love interests life and its like karma for him to experience all that in the body of his lover.
There was this super amazing scene, i think might happen here too , where he gets really turned on by his appearance in the mirror( when he's possessing his lovers body) , and he gets all horny and calls his own name, and the younger version of the jerk guys witnesses this and is quite horrified.
Honestly, were it not for the extras that soothed my heart, I would have legit killed the author XD
But don't let that keep you from reading, because I have literally been obsessed with reading the novel for a full week. It's really good.
Even if I almost went crazy because of a certain plot twist at the end.
But as I said, you get over it with the extras.
Omgggg i read this novel i think its super messed up but really interesting!!!