
It's called into the rose garden but I think its called something different on this site.
https://www.novelupdates.com/series/into-the-rose-garden/

Thats not the ending of the novel but his first life. He ends up being reborn and has a happy ending with the top of the second timeline. During that he has fragments of his first life where the top of the first life is extremely lonely and some of his kids have beef with him cause they know their dad is lying about who their bio mum.
Then the top from the first timeline also is reborn and meets the bottom again (who isn't bottom from first life) but this one is less happy since the top is so disturbed from his first life.
If anything doesn't make any sense please ask away.

Dude what u talking about this is obviously an omegaverse setting, and the ML has feelings for MC and the empress is just for political purposes, we can clearly see the ML gets pissed when MC says he has feelings for the empress because ML knows he's lying, this is clearly ur typical messed up ML who wants the MC to be broken and keep them by their side, the MC is a beta and the empress is just kept like some decorative item so the court ministers won't tell the ML to get an empress he clearly choose a powerless empress so later on it won't become troublesome
Okay, this sound so dumb. So basically from the summary and novel spoiler comment I read. Dumb uke kill the empress just because she found out about his feelings and confessed his crime by over exaggerate. So basically he bring himself into self destruction, torture and abuse. Not gonna feel bad for him lol. Also, if the emperor and empress are in love, then I understand why ml torture him when uke said what he did and cut her chest open. This vibes is similar to that toxic story where uke accidentally cause ml love to died by rape and miscarriage. I forgot the name. Just saying.
But if I'm wrong, feel free to correct me. I just read the comments and repeat what I know.