Zhèyàng ēn jiāng chóu bào de xíngwéi lìng rén hánxīn.
Repaying kindness with betrayal like this leaves one heartbroken.
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Popularized by 明·吴承恩《西游记》第三十回, where the phrase is used when the Tang Monk fears that speaking out will cause a kidnapped princess to be killed by her captor — the archetypal ingrate scenario.