My heart is full of joy. Why is Teacher Ye the last one?

The plot setting. By inquiring about the plot outline of My Heart is Beating, it shows that the final ending is blank, leaving room for imagination for the audience, so My Heart is Beating is finally Teacher Ye. "My Heart is Full of Happiness" is a youth film produced by Beijing Ivan Film and Television Investment Co., Ltd. and Beijing Happiness Rainbow Cultural Creativity Co., Ltd. and directed by Liu Ziwei.