Because the boy's dad didn't pick up the child on time, the homeroom teacher @ the child's dad in the group: "What time is it now? Why haven't you come to pick up the child yet?"

The child's dad immediately replied: "Sorry, teacher, there was a problem with the car today."
He also casually sent a photo of a Mercedes G-Class to prove he wasn't late.
The group instantly fell silent until a mother broke the silence, saying she could help pick up the child.
She probably saw the child's dad was single and wanted to hint that she was single too, so she tried to change her note to "single." But she made a mistake and directly changed the entire group name to "single."
The homeroom teacher looked confused and silently changed the group name back.
But before long, Mom Li Wanying changed the group name again to:
"Mom Li Wanying is single."
The homeroom teacher finally couldn't bear it anymore and @ her: "Please don't change the group name."
After kicking Mom Li Wanying out of the group, the homeroom teacher directly changed the group name to "Homeroom Teacher is single"...