The Demon King's Hero Development Plan

My name is Mo Yun, and I am the only brave man chosen by the goddess. This is not something worth showing off, because the more than 200 generations of brave men before this failed to survive the journey to defeat the Demon King. In order to survive, I spent five years training in Guxin City, but fortunately, there was a person named Irina by my side from the beginning to the end. She would encourage me every time I wanted to give up and point me in the right direction when I was confused. She was an indispensable part of me after I came to this different world. Until one day, we recruited the most talented magicians, adventurers, and paladins. Just when she was taking us on the road to defeat the Demon King, I discovered something strange: She knew how to get to each of the Demon King's strongholds. She knows the weak points of each of the Demon King's followers. She knows where every trap is in the Demon King's City. She even knows what the devil looks like. I regretted it until everything was settled. Because... She is the devil! ! ! ------------------ Irina grabbed Mo Yun by the collar. Mo Yun wanted to escape but couldn't. Her teammates who were traveling with her were indifferent and watched helplessly as she dragged Mo Yun into the Demon King's Palace step by step. "Let's go! Come into the house with me!"