我心疼那个笑着说不痛的自
[wŏ xīn téng nèi gè xiào zhe shuō bù tòng de zì]
'我心疼那个笑着说不痛的自' roughly translates to 'I Am Heartbroken For Myself When I Smile And Say I Am Fine While Hurting Deeply Inside.' This conveys deep, hidden pain or sadness under a facade of happiness.