To repay kindness with enmity; to bite the hand that feeds you; to be ungrateful and malicious.
他以前受过这位老师的许多帮助，没想到如今却恩将仇报，在背后说了老师许多坏话。
He had received a lot of help from this teacher in the past, but unexpectedly, he is now repaying kindness with enmity, speaking many ill words about the teacher behind his back.
Era:
Early Modern
Frequency:
Story:
Li Jing's third son, Nezha, saw the Qiankun Bow and Shocking Arrow on the city wall of Chentang Pass. He took them to practice, and shot an arrow towards the southwest, which directly hit Biyun, a disciple of Lady Shiji from White Bone Cave on Skeleton Mountain.
Caiyun童子 (Caiyun Attendant) reported this to Lady Shiji.
Lady Shiji knew it was Nezha who did it, and she angrily rebuked Li Jing, accusing him of forgetting the kindness he received years ago and now repaying it with enmity.
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