I Became an Unknown Professor at the Academy

Baek Woo-jin has spent three years playing a text-based game with 999 endings. In all those endings there is only death and misfortune for the character ‘Wolf’.

However, after finishing the last ending and preparing to close and then delete the game window, a small message window appears, offering Woo-jin a chance to create the 1,000th ending. Baek Woo-jin accepts the challenge, and possess the character Greed.