From INKR:
That year, Sang Zhi had a secret crush on a man. She fell in love with her brother's friend, Duan Jiaxu. This older brother had captivating eyes and casually called her "little kid". Their first memorable encounter always left Sang Zhi wanting to be closer to him. However, the 7-year age difference between them seemed like an impossible barrier. Little did she know, the hidden feelings she had buried in her heart started to grow, and gradually, they also grew in his heart.

Original Novel
Original Manhua

Official Translations:
English: INKR, Webnovel, Webcomics, Chereads
Others: French, Thai

Shares a setting with Eternal Love.