There is a scene in "Pink House" that describes two new people getting married. One of the sentences is "A hundred years of harmony, a thousand years of reunion congratulations!" This sentence expresses the wish for a long and happy marriage for the couple.

Later, this sentence gradually evolved into the idiom "a hundred years of harmony", which is used to bless newlyweds or to predict the long-term stability of a certain group or country, and to express the hope that their marriage or cooperative relationship will be long-term, stable and harmonious.