On this day, 77 years ago, on May 29, 1948 (April 21, 1948, the lunar calendar), Cao Yu took a film for the first time. Cao Yu In May 1948, Shanghai Wenhua Film Company completed the film "Sunny Sky". This film was directed and directed by Cao Yu and photographed by Xu Qi. This was Cao Yu's first attempt to engage in film creation. The film "Sunny Day" reveals the darkness of post-war life and the courage of upright people through the occupation of the orphanage where the protagonist Yin Zhaoshi's lawyer was a friend, and conflicts with profiteers and hooligans. When talking about the theme of the film "Sunny Day", Cao Yu said: "China has a couplet called 'Everyone sweeps the snow in front of his door, regardless of the frost on his house', with the banner: ' Don't mind your own business.' I don't think this is right. We must distinguish right from wrong, act earnestly, and be afraid of trouble or seeking injustice."