Xiaoyang's family lives on the fifth floor. This old-fashioned building, the highest is the fifth floor.

The light in the living room is on. It seems that Zheng Yuerou is still awake. Because Xiao Yang sometimes runs against other people's dormitories in school, so occasionally he does not go home once or twice, and Zheng Yuerou will not worry.

Bangbang.

Zheng Yuerou was knitting Xiaoyang's sweater in the living room. She heard a knock at the door and put down her work.

"Mom, it's me. Open the door." Xiao Yang shouted outside.

Hearing Xiaoyang, Zheng Yueru had no scruples and opened the door with confidence.

But when she opened the...