We Agreed to Upgrade the Beasts Together, Why Do You Always Mutate?

The sun and the moon are in the same sky, and the sea water pours in! A huge crack appeared in the ground, countless strange beasts emerged, and Blue Star soon became paralyzed. Chen Fan accidentally fell into a crack while escaping, but accidentally traveled to a magical world of beast control, and was bound to the original system. So "Chen Fan, your fire fox looks a bit weird, isn't it?" "Oh, it mutated!" … "Chen Fan, are you really sure you are a black iron-level pet?" "You're sure, it just mutated!" … "Chen Fan, forget it, I know, you mutated again, right?" "We agreed to upgrade the beasts together, why do you mutate every day?" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.