纸有你我才快乐纸有我你才快乐
[zhĭ yŏu nĭ wŏ cái kuài lè zhĭ yŏu wŏ nĭ cái kuài lè]
'I'm Happy Only Because of You; You're Happy Only Because of Me' translates literally. It expresses the idea of mutual dependency and happiness in a relationship, where each person feels joy because of the other's presence.