Why is Zhan Qingyun called Zhan Bubu Seed?

Study hard. Zhan Qingyun successfully counterattacked from a school scum. He borrowed 1 10,000 yuan to go to Harvard to study for a Ph.D., and his achievements were extremely high, so he was called Jambubu Seed. This unremarkable girl is covered with countless powders. In the fifth season of the Story of Seven Pavilions, Zhan Qingyun was crushed by his academic advantages, and even won the title of "Zhan Bubu Seed" in the Zhihu.