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In a snowy valley, two civilian aircraft crashed, killing one and seriously injuring the other. Qiao Lichen, who fell into a coma, was sent to Zhang's Brain Hospital to undergo a brand-new brain repair technique. After the operation, he suffered the most undesirable sequelae - what woke up was the consciousness of the long-dead No. 1 Donor, Zhang Yunhe, Zhang's former boss, while Qiao Lichen's consciousness seemed to be hidden and would only respond to certain stimuli. Because he didn't want to get involved in this weird medical incident, he decided to just say the "amnesia" part, and then lay down silently. It happens that Qiao Lichen's niece Zhong Joy is in elementary school. The biggest headache this semester is an AI activity class with the theme of "Western Han Dynasty and Eastern Han Dynasty". He would help his children with their homework while lying down silently. But what he didn't expect was that the real secret was also hidden in this activity class. The resulting twists and turns were like depth bombs, exploding the family's peaceful life. Therefore, he must choose between two completely different first half lives.