Kuzhi ()' s father, Gan (,,,), was a so-called remnant orphan left in China in 1945 when the Japanese army retreated from China. Fu (Yue), Hu Gan's adoptive mother, was very concerned about Hu Gan and gave him a Chinese name Sun Yufu, completely treating him as her own son. Gan is also deeply grateful. After entering the middle school and living in the middle school dormitory, he secretly vowed to repay this favor.

Later, during the Cultural Revolution, urban households successfully returned to Japan, found their own biological parents, and took their wives and children. His daughter Uruguchi came to China Jilin University to study in order to explore her father's past and some truths that her father didn't know, and was warmly welcomed by relatives who were not related by blood in China.

In the house where her father once lived, she saw the graduation photo Primary School photographed by her father, who was wearing clothes made by Chinese mother. She also learned that Fu, China's grandmother who raised her father, died the year before she came.

In the village, she learned about her father's past life. She knew how brave Fu needed to adopt the son of the former Japanese officer through public discussion, and how Fu worked hard to cultivate his father into an excellent talent in that poor small village.