So I'm Invincible?

Qin Feng traveled through time and entered a world belonging to immortal cultivators. The skill he created by accident is actually a peerless skill! Let it become stronger quickly! In order to survive and guide the fox demon in its cultivation, he actually transformed it successfully! A few casual suggestions turned a young man into a peerless swordsman! A few jokes made a powerful person who had been unable to break through for a long time break through! ... Many powerful men: Senior, please give me some guidance on my practice! Qin Feng: I am a bit strong, but what happened before was really unexpected! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.