你非薄荷为何薄凉你非柠檬为何心酸
[nĭ fēi bó hé wéi hé bó liáng nĭ fēi níng méng wéi hé xīn suān]
If You Are Not Mint, Why So Cool? If You Are Not Lemon, Why So Sour?: Expresses confusion and mild complaint over contradictory personality traits — finding someone cold-hearted yet they lack a reason to be so detached (not a mint); bitter and sour (heartbreaking, like a lemon without being one).