The concept of Zhenren in Zhuang Zi's book Da Zong Shi was not originally part of his theory on human personalities. The term Zhenren only appears in his Four Arguments on Zhenren, suggesting it was not as important as other concepts in his philosophy. This concept contradicts Zhuang Zi's belief in pursuing mental happiness over physical pleasure. It is likely that the Four Arguments on Zhenren were added by scholars after Zhuang Zi's time.