Harry Potter: A Certain Ancient Rune Professor of Hogwarts (TL) - Chapter 670

I became the childhood friend of the protagonist in a novel. The childhood friend who died from taking drugs.

Gu Chaoyan is the eldest daughter of the Gu Family, yet the least favorite one. She is mostly despised and belittled by everyone around, only because she isn’t pretty.

Everyone believes Lin Zhao Xi’s a genius.

Only she knows she’s looking back on years of experience in math competitions as a basis to “cheat”.

Until one day, her idol quietly looks at her.

* * *

Time and space overlap, returning thrice.

— The past can change you.

- Description from Novelupdates

She was born into a powerful family of the nobility, a blue-blooded aristocrat as capable as any man. He rose from humble origins up the military ranks, an iron-blooded knight with high ambitions. A transaction for power severed her from her childhood sweetheart. A tardy encounter was the beginning of his and her vow to meet life and death under heaven, standing shoulder to shoulder.

Political intrigue, dynastic succession struggles. He trampled through it all in the toil of becoming emperor.

Old enmities became new disputes, concerning life and death of entire families. She entered once more into the palace, changing the entire political climate of their world.

Meeting once again, they had become strangers. The peach blossom were all fallen, no more than a golden age grown cold.

- Description from Novelupdates