Taiwanese films once had a glorious era. At that time, almost all movies were shot in Beitou, Taipei, so Beitou was called "Taiwan Hollywood". Xiaojie (played by Li Yijie), an eighth-grader, never believed that Taiwanese films had such a good period, but her grandfather Liu Qisheng (played by Long Shaohua) always said proudly: "Grandpa, I was the most popular ace screenwriter at that time"... Xiaojie always doubted this matter. Xiaojie has a grandmother (played by Shen Hairong) who has dementia. Her condition is getting worse and worse. She even claims that she is the wife of Wan Baolong... "Wan Baolong" was the most popular niche in the Taiwanese film era. Xiaojie didn't understand why her grandmother always missed this person, so her grandfather began to tell her a love story that happened in "Taiwan Hollywood" that year... In 1969, the movie "Spy No. 7" was released. Audiences lined up to see the performance of Wan Baolong (Wang Bojie) who was on stage with the film. Qisheng (Lan Zhenglong), who was in a creative slump at the time, met a girl who climbed over the wall to sneak in to watch the movie backstage - Jiang Meiyue (Amber Ann). Meiyue ran away from home to chase stars and went to the north. By chance, she joined the crew and became an extra. Before long, Qisheng was attracted by the girl's quirky personality. On the other hand, he could not avoid the strong feelings that the arrogant female star Jin Yuefeng (Tian Xin) kept giving... "Spy No. 7" was a big hit in Taiwan, and the sequel was launched. Unexpectedly, not long after filming started, the director died suddenly on the set! The boss asked Qisheng, who had a dream of being a director, to save the situation, and his relationship with Meiyue also developed further. At this time, Jin Yuefeng claimed that she was pregnant with Qisheng's child... Faced with a film full of disasters and a tortuous love story that was like a movie plot, can Qisheng turn the tide? So, is grandma's dream lover Montblanc or grandpa? Decades later, Xiaojie is about to get a long-buried and touching answer from grandpa...