Starting Today, I'm Nobody's Backup Plan

Blurb:

He Qiqi is a ray of sunshine.

Warm, enthusiastic, lively, and cheerful, he never has a bad day, until he falls in love with Qi Yang.

Qi Yang is always telling him to be more composed, not to be so cheerful, not to wear white, and to wear black instead. He likes black.

He Qiqi starts working hard. He wears well-tailored black suits, keeps a low profile, and becomes the widely renowned Mr. He, until he sees Qi Yang at the airport, smiling brightly as he talks to a formidable-looking man.

The man is wearing a black suit, and his hair has the composed look He Qiqi could never manage. He Qiqi understands.

The sun is the sun. The sun can never become the moon.

He Qiqi: That's it, we're done. Give back my money, my house, and everything I spent on you.

Never be a scumbag's backup again.

P.S. The love interest is the moon, the scumbag's unattainable white moonlight.

P.P.S. Younger seme, younger seme. When the protagonist likes someone, he loves them wholeheartedly. When he doesn't, he cuts things off decisively.

Theme: Love yourself