About Me and My Mortal Enemy Sharing the Origin of the World

What should I do if the sick and weak crown prince is transported to a fantasy world in the West? Arthur said: Thank you for the invitation. People are in astrology and have just seen the end of the world. Every time it is predicted, their life span will be shortened by ten years. What should I do if I reincarnate as a demon in the world as a fairy? Mo Linyuan said: Thank you for the invitation. I am lying on my back. I was just chased and my memory came back and I just want to die. Until the system (world consciousness) sends a task: [Please cooperate with the bound object to save the world] [Warning: The opponent is an enemy from another world] Arthur looked at the black-haired and black-eyed Dongfang Jianxiu in the crystal ball: "..." Mo Linyuan looked at the two magic sticks with blond hair and blue eyes in the sea of consciousness: "..." When we first met, he cast a forbidden curse on me, and I slashed him with my flying sword. After being forced to form a team, he used a magic circle to trap the pursuers, and I used my sword energy to split the retreat. Later—— When the Holy Knights came to the city, he stood in front of me, and the starlight turned into an eternal barrier. When the Zhuxian Sword Formation enveloped the sky, I stood beside him, my sword intent splitting the eternal sky. The whole world says that we deserve life and death. The whole world is waiting for us to kill each other. Until the night before the final battle, I held down his hand where he was drawing the sacrificial circle, and he grabbed my wrist where I formed the sword seal. We looked at each other for three seconds and said at the same time: "You want to secretly be a hero?" "Each other."