It tells the story of how "I" was raised by my grandfather after my parents divorced, but was hindered in entering higher education. I sought refuge with my mother but was rejected by my sister. In the end, my mother's stepfather ("my" stepfather) reached out to help "me" study and provide a complete family. The core conveys the belief that difficulties will eventually pass, highlights the warm power of non-blood relatives, and shows the positive energy of regaining happiness and belonging in goodwill even after family changes.
That stepdad is so nice.