The term “Autumn leaves as a matchmaker” refers to the mysterious bond that connects a man and a woman through the use of autumn leaves as a matchmaker.
The word ryozoku, which means an excellent matchmaker, is a combination of Momiji and Momiji, which literally means Momiji becomes a matchmaker. During the Tang Dynasty in China, a young man named Yu Yu picks up a piece of autumn leaf with a poem written on it from a stream flowing through the imperial court. It is a four-character idiom that was born from the story that he also wrote a poem on a maple leaf and played it around, and that the woman he later married, Han Sui-feng, was in possession of the maple leaf.
 

Autumn leaves good medium = Kouyou Ryobai

The four-character idiom ``Autumn leaves'' is read as ``Kouyou Ryobai''.
 

Learn Japanese words “four-character idioms”
Four-character idioms, which have been popular in Japan since ancient times, are words made up of four kanji, as the name suggests. Although it is said to have originated from Chinese, the four-character idiom, which is short but has a condensed meaning, is still used in various situations today as a means of concise expression. Here are some four-letter idioms that you may have heard but don't know what they mean, or you've seen them but don't know how to read them.