YAS my two actress biases are probably good friends? Tell me they are.
Because Li Ying is actually singing to support a movie Zhou Dongyu is in. She is usually shy of singing in front of people (though ironically she rose to fame through a talent competition where she sang) so the fact that she was willing to exert all this effort for Dongyu means they probably are pals.
Li Ying then tells Dongyu to send her a message on Weibo to express thanks, haha.