Notice how the sub was only motivated by money?
Wei Minzhi, the 10-year-old substitute teacher seems to only care about one thing: money. And to that end, she'll do anything to get it, including the following:
1) Endlessly chase a tractor carrying the local village head and Mr. Gao in order to get her 50 yuan promised payment;
2) Hide the little girl, and then chase the SUV that comes to take her away to a different school in order to guarantee that she'll get the extra 10 yuan when Mr. Gao gets back for having perfect attendance -- Not one less;
3) Basically walk to the next biggest city and do everything from making 100 wanted posters by hand and waiting a day and a half in front of the TV station stopping everyone with glasses in order to talk to the station manager, with hopes of getting the word about her lost pupil, who threatens to deprive her of the 10 yuan bonus for holding on to all her students at the end of the month.
However, notice Wei doesn't seem to care one iota about the rest of her duties, can't teach herself out of a paperbag, doesn't really care about her students and basically ignores them, cos there ain't any money in it. She, like a typical money-grubbing peasant is only focused on things that will make her a quick yuan. And actually teaching, which she was ostensibly hired to do, is not part of it. Anyone agree that she was a greedy little chick, and not necessarily motivated by altruism or things of a higher nature, like compassion or concern for the lost student?