Society, everywhere, is often filled with injustices.
Liu Chengjie was one of those oppressed by the injustices. Compared with Zhang Wei, his situation was depicted with a certain sense of drama, particularly where 'luck' was concerned.
Both were educated to an equivalent level, both were about twenty-seven when they earned their Ph.D. degrees at Yanhua University, then started working at the Biomedical Research Institute.
Zhang Wei was lucky. After joining the Biomedical Research Institute, she started working on a project with Dai Tianqing. She received a lot of care and attention. She'd initially known nothing and gradually gained experience, produced research results, published several articles, and was then 'promoted' to Deputy Researcher.
Having been a Deputy Researcher for two years now, working on collaborative projects with others and her personal projects, she has accumulated quite a wealth of experience.