The next sentence of the girl's signature "If Spring is Bright" is "There is no smoke without waves, and the sky is up and down".

If spring is peaceful, the scenery is bright and the sky is calm, which means that when the spring breeze is warm and sunny, the lake is calm, there are no stormy waves, and the sky and the lake are connected. This passage is from the Yueyang Tower written by Fan Zhongyan in the Song Dynasty. The article describes the scenery of Yueyang Tower and the different feelings brought by rainy and sunny days.