Dong Yuhui's student posted a photo eight years ago, and Mr. Dong's mushroom head is so green and mingles with the students! Dong Yuhui's student posted a photo eight years ago, and Mr. Dong's mushroom head is so green and mingles with the students! Dong Yuhui's student posted a photo eight years ago, and Mr. Dong's mushroom head is so green and mingles with the students! Dong Yuhui's student posted a photo eight years ago, and Mr. Dong's mushroom head is so green and mingles with the students!