Why do Korean Go rules require that "dead pieces" be placed on the lid of the chess box?

On the 22nd, a dramatic scene occurred in the second round of the three-game final of the 29th LG Cup World Go Championship held in South Korea. Chinese chess player Ke Jie lost the game due to a foul because he failed to put the opponent's "dead pieces" into the chess box cover twice as required by the rules. What exactly happened? Why does the Korean rule require the "dead pieces" to be put into the chess box cover?

In this regard, Chinese chess player Jiang Zhujiu said that for Japanese and Korean chess players, the chess pieces are placed in the cover of the chess box and can be used to judge the situation. But Chinese chess players are not used to using dead pieces, and it doesn't matter whether there is such a piece or not. This does not directly affect the outcome, but the habits of the two players are different.

Editor: Yang Shijie