"A man calls his sister-in-law at a love concert in China, Ye Qitian" is a vivid Cantonese expression. In Cantonese, "eldest sister-in-law" is a title for older women with a history of marriage. If a man calls a woman "sister-in-law", it may imply that she has some feelings for herself, which may be admiration, joking and playing. In this concert, this slogan is regarded as the "decompression mouth" of the audience, symbolizing the joyful, relaxed and humorous atmosphere, and also implying the tacit understanding and friendship between fans and singers.