President of alma mater says ”President Yoon is embarrassing”... Presidents of alumni association urge him to resign (South Korea)

On the 24th, former alumni presidents of Chungam High School in Seoul, the alma mater of South Korean President Yoon Seok-yeol, called on Yoon Myung-wha, chairman of the board of directors of Chungam High School, to "resign."
This is a response to Chairman Yoon's recent public criticism of President Yoon, calling him a "disgraceful graduate." The heads of the Chungam High School alumni association visited Chungam High School on the same day and delivered the above-mentioned speech.
In a statement, the group handed over a letter of demand for an apology and resignation to the president, which included not only Chungam High School but also elementary, middle and kindergarten schools.
"The remarks were made in a public forum to defend his position," he said, criticizing the school, saying, "It is extremely inappropriate for the head of the school to make such political statements regarding a sensitive issue that could provoke social conflict."