It's kinda similar to these two https://www.mangago.zone/read-manga/palace_of_bardo/
https://www.mangago.zone/read-manga/rebirth_1/
If ur into regression, u should check these two also
Following
https://www.mangago.zone/read-manga/reincarnated_as_the_omega_villain_in_a_bl_novel/ then go read it on the legal web it's for free
https://www.mangago.zone/read-manga/how_to_raise_a_victim/
https://www.mangago.zone/read-manga/don_t_provoke_reborn_ed_bamboo_horse/
https://www.mangago.zone/read-manga/kiss_the_abyss/
https://www.mangago.zone/read-manga/i_have_to_be_a_great_villain/ no one killed anyone but something similar
https://www.mangago.zone/read-manga/silent_lover/ so many shitty drama
https://www.mangago.zone/read-manga/i_m_here_to_take_my_revenge/
https://www.mangago.zone/read-manga/meteor_orbit/ didn't really kill him but it was because of him
https://www.mangago.zone/read-manga/turning/ same
https://www.mangago.zone/read-manga/don_t_want_to_see_you_in_the_next_life/
I don't know what you exactly need so I just recommended the one with go back in time
The seme killed the mc, and then somehow the mc regressed back to the time when he first met the seme.