Responses
https://www.mangago.me/read-manga/dead_man_switch/
ik exactly what ur talkin about but im unsure whether it was this one
sorry its probably this
https://www.mangago.me/read-manga/how_to_raise_a_victim/

Hi, everyone who saw this, I'd like the Internet to find a story here(?) For me...
I remember it's about the ml killing the mc over and over again, thinking that he's a player trapped in this world. Then it gets revealed that mc is actually the Player transmigrated that transferred his memories(?) To the ml before being reset again.
The ml is searching for the "endings"