There is a Chinese international student who is always neglecting their studies and doesn't know what crime they committed,

and ended up serving 18 months in prison in the United States.
Although they couldn't speak a complete sentence in English when they went in, by the time they got out, their spoken English was comparable to that of a native speaker.
Now they are working as an IELTS teacher at a top-tier training institution in Shanghai. Sometimes I really feel that American prisons can change people more than American universities!😂👍