Cheonmayukseong

A scout in the infamous Demon Cult, Seol-Hwi is on a routine patrol when his squad unexpectedly encounters a fearsome master of the Mount Hua Sect, the sworn enemies of the Demon Cult. Without warning, the Mount Hua Cult master slaughters the entire squad. As Seol-Hwi lies dying, lamenting years of service to the cult with nothing to show for it, he is suddenly faced with a video game prompt, asking if he would like to start again. Given the opportunity to start over and make different choices, Seol-Hwi vows to survive and become stronger so he can rise to the top of the Demon Cult.

(Source: WEBTOON, edited)