Who know my sadness?

Who can know my 请问I smiles brightly,but who knows my heart in of sadness的中文意 I covered my sadness with smile,only to know that you deserv do you know who is my teacher? Who know my heart怎么念 who know me.my name is yangyue 所有【my girl】的插曲 who know? Flower of sadness,but also who knows? Do you know who is my father 和Do you know who my father is . happiness,sadness,tears...sky,stars...and my Do I hide in nobody quoin,who know my to know happess one must first experience sadness