Memorize

Having been summoned to the alternate, game-like universe of the Whole Plane 10 years ago by mysterious angelic beings, Su-Hyeon has finally reached the Apex of the world. But at what cost? Using his privilege as the Apex, Su-Hyeon invokes the power of Code Zero to go back 10 years and rectify his past filled with tragedy.

(Source: Pocket Comics)

Note: Based in the same universe as "Tamsigui Jaerim.".