I remember it was in Webnovel's trial reads pool. Protagonist somehow gains the ability to live in a different world for 6(?) months at a time, and he can have a helper with him. Instead of AI, for some godforsaken reason, he decides to pick a copy of a person from irl. He picks his pretty boss, and a system generated copy of that pretty boss appears with him, romance and drama ensues in those 6 months. It had a pretty high rating at the time too, 4.7 or something. I'm not sure why it ended up not being put in the voting pool compared to 2 star novels that no one liked at all, but yeh. It's disappeared from there, so I've forgotten the title.