You have seen "The Legend of White Snake", right? The version starring Zhao Yazhi is the most classic.
Xu Xian met the White Snake by chance in the West Lake. Although she went through ups and downs, she never left her. In the end, she achieved perfect merits and a harmonious family. From then on, it became an eternal legend.
It means "Don't force things in love, it will happen naturally when fate comes." One day you will meet the person you like, and you will grow old together happily.