No-Harem ୧•░║║░•୨ACTION -Gem Box 2

Mc was a disciple of the Heavenly Demon but gets betrayed by his disciple-brother and dies. When he woke up, he goes back in time when he was a kid, before he got dragged into the Demonic Sect & this time he decides to go to murim union instead

mc an ordinary high school senior in Korea, was suddenly summoned to another world, where he became a dark mage after lot of hard work he finally able to return to korean after 2 years but during those times dungeons already appeared on korea ..But due to dimension travel he lost all of his demonic energy & skills too .. so he is gradually trying to regain them & finally after absorbing demonic energy he was able to view his system screen

Anyway so mc was the strongest in the yokai realm became the king there ....Later he gained the chance to become a human being after losing the woman he loved and killing countless yokai since he wanted peace ...so mc got transmigrated into the body of a young master from merchant family with weak ass body ..