Reincarnated into a Cursed Game

Story:

An overworked game developer dies and is reincarnated as the weakest character in the game he created himself. Challenged by Jaeseokcheon, the ruler of the game universe, he must complete a series of quests to survive and prevent a second death. Epic battles between monsters, celestial beings with magic powers, and Jaeseokcheon ensue. In this tug-of-war between the omniscient game designer and the hidden mastermind ruler… Who will win?