You're Beautiful When You Smile (Falling Into Your Smile)

Disclaimer: The story is not mine nor the translation. Credits to the original writer of the novel and those people who translated it.

Secretly, Secretly; But Unable to Hide it

The time she is thirteen years old, Sang Zhi secretly has a crush on a man.
 That man looks cold and sluggish, he can be described as someone that is careless and casual. He frequently comes to her house. One afternoon, he stays at her Ge Ge's (Older brother, 桑延) room to play a game.
 Once in a while when he sees her...