你看不到我的情绪却看到我心里的滋味
[nĭ kàn bù dào wŏ de qíng xù què kàn dào wŏ xīn lĭ de zī wèi]
Suggests that while others cannot see the person's outer emotional expressions, the depths of their inner sentiments and experiences are profoundly felt by themselves, possibly alluding to hidden emotions.