Can anyone help me find this bl, it was a historical one, so like the seme was a emperor? ...

Can anyone help me find this bl, it was a historical one, so like the seme was a emperor? I think, with uke they have a relationship, then at some point the uke got imprisoned and there he was poisoned to death, then he was able to go back to the time when he was younger, and there he met the seme again as a child, after he died on his last life the seme killed a hell lot of people

I wanna catch up on that and see if they updated already but I somehow forgot the title now I didn't even saved it on my list ╥﹏╥