Neoreul Jugin Dwie

Mismatched lovers Eun-Seong and Hyeon-U face a bizarre twist of fate. When Hyeon-U abruptly ends their relationship, Eun-Seong finds himself committing the darkest of crimes. However, Eun-Seong wakes up in a world where the cold body in his arms isn't Hyeon-U's and instead, he's the one who's been killed... In this surreal switch, Eun-Seong realizes a chilling truth—their destinies are entwined in a dark cycle of love and murder. Despite this deadly paradox, Eun-Seong still believes they are meant to be together, and this time he won't let anything get in his way...
(Source: Lezhin, edited)