我是良药你却说我苦口
[wŏ shì liáng yào nĭ què shuō wŏ kŭ kŏu]
Meaning 'I am good medicine but you say I taste bitter.' It suggests that even though the person is beneficial or well-meaning, others might perceive them as unpleasant or difficult due to misunderstandings or first impressions. Often used metaphorically.