Synopsis：Duan Jia Xu and Sang Zhi became acquainted due to an incident at Sang Zhi's school that required parental involvement. Since then, Duan Jia Xu has treated Sang Zhi like his own younger sister with affection. As Duan Jia Xu graduated from university and the two were separated by distance, misunderstandings caused their relationship to grow distant. It wasn't until Sang Zhi, now an adult, successfully got into the same city's university as Duan Jia Xu that they were reunited. Through their increasingly close interactions, Sang Zhi gradually discovered the source of Duan Jia Xu's long-standing stress. She wanted to protect this kind-hearted "big brother" and rekindle the buried feelings of admiration. With Sang Zhi's support, Duan Jia Xu slowly untied his emotional knots and genuinely fell for the grown-up Sang Zhi. Their pure, once-hidden admiration blossomed into a beautiful love story, as they experienced the growth of youth together, encouraging and supporting each other.