我强颜欢笑不让你感到孤独
[wŏ qiáng yán huān xiào bù ràng nĭ găn dào gū dú]
Meaning 'I Put On A Forced Smile So You Won’t Feel Lonely.' This portrays self-sacrificing kindness, placing another's feelings before one's own, trying to comfort and cheer them up despite inner turmoil.