Qi Dajun is the Director of the second workshop at the machinery factory. He was the first to object to Du Yimeng's rapid promotion, stating that it was against regulations since she had only been working at the factory for over a month. His main concern was that Du Yimeng was promoted too quickly, reaching a position equal to theirs in a short time. However, Yu Hongru outsmarted him by making him the chief of the newly established R&D department, a position that came with the burden of submitting monthly reports and handling all R&D tasks. Qi Dajun was not suited for research work as he only knew how to swing a sledgehammer. He was initially shocked but ultimately relieved to have avoided losing his position as director. He was willing to publicly support Du Yimeng's promotion to save his own position, showing his pragmatic nature.
