I, Who Was Reincarnated as the Villain Character in a Game, Was Secretly Enjoying My Role as the Villain While Pulling off Heroic Moves Behind the Scenes. However, My Actions Were Exposed to My Fiancée, Who Absolutely Despises Me

Using game knowledge and strength training to avoid a future of destruction! I was a corporate s*ave in a black company, but before I knew it, I was reincarnated into another world. And not just any world, but into the role of the villain in a game I loved… In order to avoid the future of being killed by the protagonist, I start taking actions to become stronger with all my might. Utilizing my knowledge from the game, I focus on one thing: strength training! As I live this way, gradually, the attitude of my fiancée, who used to hate me so much, begins to change…?