Burnt to Ashes, Leaving Only You

Gu Sheng was blessed with a beautiful face, and when she smiled, the dimples in her cheeks were faint and utterly intoxicating. She looked delicate and gentle, but inside she was venomous, nothing like she seemed.

So when Jiang Ran first saw her, he thought she was exactly his type. Once he fell for her, he was hers for life. Even after he discovered his girlfriend wasn't as gentle as he'd imagined, he accepted it.

Scenes:

Jiang Ran: "Shengsheng, every couple argues sometimes. We will too, but we'll make up. There'll be misunderstandings, but we'll clear them up. So, Shengsheng, our love will only grow, never diminish."

Jiang Ran: "You don't have to change. I'll slowly learn to adapt to you."

Jiang Ran: "Be good, Shengsheng. Stay right there. I'll come find you."

Gu Sheng: "Jiang Ran, I gave you a chance. This time, I won't let you go again."

Jiang Ran: "I couldn't ask for anything more."

Among all the people in this world, he only wished to give one person his devotion, and spend his life longing for her.

The early chapters are set in school, followed by a postmodern arc.

A heroine who seems delicate but is secretly a martial arts powerhouse VS a true "don't look down on a poor young man" hero

PS: A doting romance, both leads are each other's first and only, and both become powerful in the middle and later parts.