Mythical Beasts: The Useless Lady Is a Genius! - Chapter 15

I was thrown into a novel that hasn’t even been completed yet (and turned into a girl…), guided by the omnipresent voice of the unreasonable, amateur Author as he writes the web novel. I have no idea what’s going on, so I have to stick close to the main character to make sure I don’t hit a bad end…Why are you treating only me like this!I’m not suspicious, believe me.I’m a harmless person.“A villain? Not at all.”

Lin Chen was persecuted by his childhood sweetheart and accidentally obtained an ancient legacy. From then on, he embarked on a path against the heavens!“I am a sovereign! Those who insult me will be killed, those who obstruct me will die!”

A river song, triggered a legend of the rivers and lakes.
Tian Zun’s life motto: “My sword is the truth.”
Shen Lang’s life motto: “To serve people with morality, those who are dissatisfied are dead.”

- Description from uukanshu (translated)

16 years old-- most boys would be falling in love, as their hormones all rise to unprecedented levels. Most boys at Riley's age would have dreams; dreams that will slowly grow into passion. Riley, however, at age 16... killed the world's number 1 superhero.