as one's best friend
As a Chinese idiom, Pinyin is sh ì w é izh ī J ǐ, which means to be a good friend. From the romance of the former Han Dynasty.
The origin of Idioms
The only reason for this was that the eunuch took care of the husband, but he was in collusion with the baby. He always made friends with the baby and did not change his old style. So the baby regarded him as a confidant and was very affectionate. The 63rd chapter of the romance of the former Han Dynasty by Cai Dongfan
Idiom usage
Used as a predicate or attributive; used in communication.
as one's best friend
confess to false charges under torture - qū dǎ chéng zhāo