Friendship Goes Sour

In the evening, the bedroom curtains were tightly drawn and the room was dark. Zhou Xuan stared at the door. Her hand that was about to open the door was dissuaded by the quarrel coming from outside. She sat weakly on the floor leaning against the door. Tears ran across her face and dripped to the ground. The corners of her mouth curled up with a bitter smile. But the next day, she walked into Class 3 and Class 10 of junior high school with a smile on her face. She was always like this, severely polarized, either extremely happy or extremely painful, and that day the class teacher brought a transfer student... Intention:=