Help find Bl manhwa

Idk if I was hallucinating by a long time ago, I read a BL manwha that was a historical one with mpreg and it had angst like a lot and I remember one thing that was at the end or like close to the end of it it revealed that the seme was hallucinating him and the uke having children when the uke died is this an actual manhwa?? I know it’s not a trace of a margin. I read that already and it’s very similar.