Zhu Ren was not a kind person like his name suggested. He was a very despicable person, but he was very smart. All the bad news about him was hidden by him. There was no negative news about him on the Internet. Zhuang Liu also found a few people in the research institute to find out what Zhu Ren did on a daily basis.
Moreover, Zhu Ren's family had some status. Otherwise, he wouldn't have entered that laboratory with very strict requirements.
It was said that high academic qualifications would only eliminate people with poor grades, not people with bad character. This was true. Since Zhu Ren was able to work in that laboratory, his IQ was definitely not a problem. However, judging from the fact that he had harmed others, this person's heart was definitely dark.