tǎo​rén​qíng

to ask for a favor back

讨人情 討人情 tǎo//rén​qíng
to ask for a favor back
To ask someone you previously helped to return the favor; to remind someone of a kindness you did for them in order to get help now
to use connections
To use one's personal relationships, influence, or status to ask someone for a favor or to settle a matter