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Ding Changwang (played by Guo Jin'an) has been intellectually disabled since childhood, with his intelligence level remaining at that of a seven-year-old. He was raised by his single mother. Although Changwang has a low IQ, he is honest and very kind-hearted. He grew up with his neighbor, Afeng (played by Xuan Xuan), and they have been childhood sweethearts. When Afeng went to college, Changwang even gave her all his savings so that she could study in the United States without worry. After Afeng graduated and returned, she joined a local major conglomerate, Zhong Group. To protect Afeng from being bullied by bad people, Changwang also joined Zhong Group as a messenger. The boss of Zhong Group (played by Qin Pei) is actually Changwang's biological father, and his older brother from the same father but different mother, Zhong Zicong (played by Huang Zongze), is also a manager at Zhong Group. Changwang's helpful and dedicated attitude towards life has influenced many people around him. However, can his seven-year-old level of intelligence handle the hypocrisy of the adult world?