Reversed Dungeon

[Tutorial will begin. Create a dungeon and defend against monsters.] A world where demons rule the continent. I was transmigrated into the game <Reverse Dungeon>, where I had to play ‘Dungeon Defense’ to survive. As the most useless character, Prince Ian. Jeong I-won, a hardcore player of the game, tries to gather 4-star heroes to defend the dungeon at all costs. Then one day, he encounters a character he could never meet in the game, The 5-star hero ‘Paladin Keith’. “You are one who follows the will of God. It is an honor to meet you here.” Keith? This character shouldn't be appearing in Ian's route. Because he was a playable character like Ian. ‘Wait, he’s in this world?’ Then...