The Annoying Tagalong

Xu Fengyao's father remarries, and his stepmother brings a boy with her.

In front of their parents, the boy obediently calls him "big brother."

At school, he says they're just classmates.

What a hypocritical, annoying guy.

Shi Guan X Xu Fengyao

The leads have questionable values. If that's not for you, please leave.

Early on: A sharp-tongued, hard-hearted, hard-as-diamond high school boy gong, and a silly, tsundere, soft-hearted, responsible older brother shou (for reference only, I copied this).

Later: A clingy puppy gong X a gentle older brother shou

(My personal opinion. He really becomes a shameless simp later, so run if that's a dealbreaker.)

Theme: I hate you