我不是薄荷为何心凉
[wŏ bù shì bó hé wéi hé xīn liáng]
The user may feel coolness in heart but isn't a 'peppermint'. It's used as a metaphor for having an aloof personality but feeling cold inside. This can suggest a sense of loneliness or indifference, questioning the reason behind one's inner emotions.