My Scheming Childhood Friend Is the Big Villain!

Gu Ran's father is the leader of the martial arts alliance, and her mother is a princess of the imperial court. Her family is powerful and wealthy, her parents are happily married, her older brother is dependable, and as the eldest daughter, she ought to enjoy a life everyone else envies. And she does.

One day, her father brought home a teenage boy and took him on as a disciple. Well, a disciple was a disciple. Though he was five years older than her, Gu Ran didn't mind. She was still the mighty senior sister!

But she never imagined that her new junior brother would be such a schemer. He not only stole her playmates and got her scolded by her father, but also caused her to fall into the water and nearly die.

When she woke up, Gu Ran suddenly opened up her Ren and Du meridians. No, that wasn't it. She remembered a little of her past life, though it didn't seem particularly useful. That is, until one night she dreamed of a wildly popular martial arts drama she'd watched in her previous life. Its martial arts overlord protagonist was also the secret villain, and by the end he had not only conquered the martial world but controlled both the righteous and evil factions, plunging the entire jianghu into darkness! The protagonist was called Chen Xiao, and as a boy he had stayed with the Gu family, whose patriarch was the former leader of the martial arts alliance...

A bright, cheerful, beautiful heroine who cares about her appearance x a calculating, two-faced, dark-hearted hero

Theme: Never forget who you are.