Faust

 was a Supernatural Webtoon Original crated by Arechan; it concluded on March 4, 2018.

Synopsis
''Your soul is the most valuable asset you own, and even if you don't want it, there are others who will gladly take it off your hands. This could happen to anyone, but we will follow the story of Gabriel, a young adult who, in his darkest hour, may have found a good use for the soul he didn't want any longer.''

Related

 * LUFF: Same creator