They bang on the door until I get out of the tub and unlock it so they can ask me something that could have waited.
Ms Liu is also a compassionate and charitable person.
In the video, the teacher is repeatedly yelling at the student who is fast asleep with his head tilting back during the class.
Ms Liu said once she went to attend a friend's wedding with her son, who works as an assistant at a film production company.
The way that he's holding her and the way that she's leaning into him makes it seem like they're going out with each other when, of course, they're related.
Instead, Ms Liu, a fitness fanatic, attributes her youthful looks to the regular exercise she's kept to for three decades.
So the first question a lot of people probably asked was the age of the boy.