Japanese railroad fans were angry about it.

(1)Retirement Day of the 113th Tram, a symbol of modern Japanese history
(2)When you come to the last stop, railroad fans gather to film the train.
(3)At that moment, someone opened the window and shook the Korean flag.
(4)Fans who were about to film the last scene are angry.
(5)Some say that the harsh forces did it on purpose, considering that the Taegeukgi was held upside down, but nothing has been revealed.