There is a joke, I don't know what it means.

I think so, too. When you get married, there will always be a New Year cake in your wedding bag. Men think of their ex-girlfriend getting married when they see rice cakes. He was lonely and cried.

Another possibility is that his ex-girlfriend likes eating rice cakes. When he eats rice cakes, he will think of his girlfriend. He was very sad and cried.

It is purely my own idea,,,,