"Happy Lovers". According to the query on Kugou Music official website.

1. Excerpts from the lyrics: I always think of you, those innocent days, when you were willful and I let you go, I always felt that it was a good match. The memory is like your voice, sticking to my ear.

2. "Happy Lovers" is a song sung by Zheng Yuan and his junior sister Shen Dandan. It was written and composed by Lai Yinsheng and was included in his album "Yuan Love Song" on January 29, 2008.