This Time, We'll Make It (Cheong San X Su Hyeok)

Cheong San was convinced that he had died. He felt the flames, he felt the crash, and then he felt nothing. So it doesn't make sense that he wakes up to a peaceful time before the apocalypse started. Cheong San, not sure what is going on, resolves to do things differently this time in order to save everyone he loves. However, what he didn't count on was falling in love with someone different this time around.