Regression/Isekai/Possess other body (BL)

Based on popular novel
reincarnation & isekai
MC was born on this world with previous memory of living on earth

Reincarnation

MC died in his first life, reincarnated as a slave with his memories of previous life & inheriting his previous magic & combat abilities.

TW : MC & ML age gap is around 17 years.
MC in 1st life was 25yo when he died, while ML was 17yo at the time. MC reborn as a baby slave in ML empire.
ML forced MC to be his concubine (read : rape) when MC was still a minor (around teenager below 18). Time skip age progression is so much later.

Isekai in to a video game

Remember past life. I personally don't like it so I don't recommend but it has high rating. Based on novel

Reincarnation. MC & ML already died like long long time ago. Like really long time ago. They both reincarnated & reunited again, MC remember his past life while ML doesn't

Isekai & Possession. MC isekai into a novel and possess the body of ogFL's friend

Isekai & Possession. MC isekai into a novel and become a side top character

Regression to 11 years ago. Based on very popular novel with over 1000 chapters. Focusing on saving country. Slow romance. ML was killed by MC in previous life.

Regression

Reincarnation & Isekai. MC & ML died in fantasy medieval era time, reincarnated in modern japan time. MC is an idol and ML is a manager

Isekai. Transmigration into omegaverse world but with current body & name

Uke Possessed other body after he died. All 3 characters are pitiful.
Original uke, current uke, seme are all blamed for being born. Unwanted child. They all grew up unloved.
Current uke body Ye DoYoon family are all fucked up. I hope they rot in hell. Thinking how original Ye Do Yoon actually died before gaining happiness in his life is sad.
At least kim do yoon alive and happy with Han Gyeol but Ye Do Yoon is dead for nothing, he wasn't even bad person

Possession