Thx for the recommendation, but it's too late to do the student visa. And to be honest, I can't afford paying for the study fee of even the cheaper Chinese programs right now, anyway.
My original plan was to wait if the current visa situation eases. If, then use one of the agents to get a 3 or 6 months F visa. If not, then borrow 3000USD from a friend and extend the L visa again, and then wait for the current visa situation to ease, and then go to agents.
Visa situation hasn't gotten better. And the broken link is that the friend I was hoping on to borrow money from, hasn't replied me this time, probably finding this already too troublesome.
Tomorrow morning gonna make a try at the Public Security Bureau, trying to extend 30 days without having 3000USD on my bank account. If they clearly say no, I go buy a train ticket to Shenzhen. And go visit HK. It's a nice city anway.