长歌于她曲终遇他
[zhăng gē yú tā qŭ zhōng yù tā]
'Chang Ge Yu Qi Zhong Yu Ta' means that a person was singing songs with deep feelings for her. But the music finally came to an end. Just at this point, 'he', someone important, suddenly appeared. In some contexts, it may also imply that love has its ups and downs, and you may meet unexpected people after long waits.