Darling <3

Desc: the MC died and then reincarnated/went back in time to become a prince emperor. At first he thought he was lucky, but then turns out someone important in the ministry (lol sorry forgot his position) has been fucking around with the prince before this, and not in a loving way either. But then the other dude is like "You're different now" and starts falling for the prince emperor fr this time.
I think like there was a plotpoint later on where it turns out the prince emperor was just a fake substitute incase an assasination happens, and the other dude was the real successor all this time??? Maybe maybe, not too sure bout this.
Hopefully my bad description is good enough, i really want to read this again!

Guys pls help me search for this one BL!! So the plot is that theres this one young detective whos really good at his job and everyone praises him for being such a good investigator. And during his time as a detective, he's had a long rivalry with a masked criminal(I think?), but later finds that the masked criminal had been caught. Unconciously, he feels disappointed because it was too easy. He gets requested by a man who wishes for the young detective to find out who he is, because the man had forgotten his memory and he himself doesn't know who he is. The young detective gets intrigued and has suspicion the man might be the true masked criminal, but he just doesn’t remember, maybe. I think there was also a chapter where they went to a night club for some reason?? Bout' all I can remember.
Hopefully my description is good enough!