The movie tells the story of Hao Shuai, who is experiencing a mid-life crisis and suddenly learns that his 10-year-old son Duoduo is not related to him by blood, so he takes Duoduo on a "child exchange trip to the West" and tells Duoduo that this is a "summer growth plan." On the train, Duoduo learned his father's real plan and ran away in anger. Duoduo, a grown-up kid, arrived in the west alone and began to enjoy a unique "good time". Hao Shuai, who got off the wrong train, regretted it and experienced all kinds of embarrassing things along the way, looking for Duoduo. On the other side, Duoduo's biological father Jin Dafa, who was in the western countryside, also sent people to search after he learned that Duoduo was missing. Although he cooperates with Hao Shuai on the surface, he is secretly selfish and tries his best to take both his adopted son and his biological son as his own. In the end, Hao Shuai traveled thousands of times to find Duoduo at Jin Dafa's house, and they also met their respective sons; but at this moment, a "Hongmen Banquet" was about to begin. Standing at the crossroads of human nature, is blood or true love more important? It's like God made a joke, and it's more like a gift to each other.
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