"Happy Little Things" is the chibi-style animated sister series of "Happy Things," telling the story of the post-80s generation's Xiao Dong and Xiao Xi returning to their childhood. The film continues the consistent style of "Happy Things," blending humor and comedy while containing many everyday philosophies of ordinary people. The character designs incorporate many chibi elements based on Wang Yunfei's original concepts, while still maintaining the essence of the original "Happy Things."