狗咬呂洞賓，不識好人心
gǒu​yǎo​lǚ​dòng​bīn​bù​shí​hǎo​rén​xīn

to ill reward kindness

Senses

狗咬吕洞宾，不识好人心/ 狗咬呂洞賓，不識好人心 gǒu​yǎo​lǚ​dòng​bīn​bù​shí​hǎo​rén​xīn to ill reward kindness

a dog biting 吕洞宾 lǚ​dòng​bīn; to mistreat a person who is trying to help you or show you kindness

References

see 狗咬吕洞宾，不识好人心/狗咬呂洞賓，不識好人心 → 吕洞宾/呂洞賓