Gradually, the expression pack of heart abuse originated from pandaren's expression pack. The prototype of "pandaren emoticon pack" originated from an advertisement abroad. Because of its magical advertising series, it became popular on the Internet. Killing Heart is one of pandaren's emoticons. It is to add the phrase "gradually killing the heart" next to the panda's head expression to express the feeling that the mood is about to get out of control and can't stand it any longer.