Demonic Chaos? I'm a One-Punch Man in Fantasy

[Demon slaying + future empress + relaxed freehand + One Punch Man] This is a chaotic fantasy world. Warriors and monks coexisted, and demons and ghosts were rampant. Shen Yi, who traveled through time since he was a child, was considered to have no talent for martial arts. He started practicing martial arts at the age of sixteen and remained in the body-building realm for four years. He wanted to lie down. After completing the physical exercise, he actually awakened the automatic martial arts training system. As long as he lies down, he can improve his level of cultivation by one level every day, but... "Why is my realm always the body training realm?" But it doesn't matter! There are benefits to exercising! Shen Yi looked at the Holy Maiden of the Demon Sect in front of him. The nine-tailed demon fox grinned at the princess and opened his broad arms: "It's time to shake up the world!" … I am at the tenth level of the body-forging realm, and I am obedient... I, who is at the thousandth level of physical training, strike hard... I am at the 10,000th level of the Body Forging Realm, and even an immortal was reduced to dregs with one punch...