On Oct 16, 1964, the first atomic bomb developed by the Chinese detonated successfully in Lop Nur, Xinjiang Uygur autonomous region. Among the countless painstaking nuclear bomb workers who exert their utmost effort for this moment, there was an ordinary technician called Wang Ronghao.

Wang's hometown is in Shengzhou, a county-level city in eastern part of Zhejiang province. In his yard that we saw the famous walnut tree, which, by his wife, was the witness of Wang's promise.

Due to the particularity of the work, Wang never told anyone about his job as a nuclear bomb technician, including his wife Wang Xianqin. But he ensured her that he left home for nothing but to do a great thing for this country.

Wang Xianqin, being particularly optimistic, took his promise. "My husband is doing extraordinary work. I can't hold him back. I have to take care of the household for him," she said. 

For the next two decades, the couple could only see each other during one month of annual family leave, but no one complained anything.

In 1970, Wang Ronghao came home from Southwest China's Sichuan province, taking three walnut seeds with him. The climate and soil in Shengzhou were not suitable for walnut trees to grow, but through the loving care of his wife, one seed survived. Since they never had a child, this walnut tree later became Wang Xianqin's emotional anchor.

Fifty-one years have passed since 1970. In these 51 years, the small walnut seed has grown into a towering tree. At the same time, the impoverished China, starting from the first domestic atomic bomb, has become a nuclear power in the world today.

Walnuts and nuclear weapons share the same word "he" in Chinese (Chinese：核） as well as similar characteristics. They are unbreakable. Though humble in appearance, they hide gold inside.

Every small step of history casts a shadow on ordinary people. Every small story like the one under the walnut tree reflects the vicissitudes of the great times.

The love under the walnut tree has been adapted into modern Yueju opera, and will be staged in Shengzhou and Beijing to let more people feel the patriotism of common people.