Tā chūyù hòu tuōtāi-huàngǔ, biànchéng le yī gè hǎorén.
After getting out of prison, he was completely transformed and became a good person.
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Originally a Daoist concept: shedding one's mortal body (脱胎) and exchanging one's bones (换骨) to achieve immortality. Now used metaphorically for any radical personal or structural transformation.
