I think Liang Xu's constellation lovers are two singers, but who is the other?

Constellation Lovers is a song composed by Xu Liang and sung by Xu Liang and Wu Xin. [1] Liang Xu, a new generation idol in the Mainland, is about to release a brand-new original album. From the release of the first song "I will be OK" to the latest music source "Constellation Lovers" this week, both online and offline have aroused strong fans' pursuit. This love song "Constellation Lovers", which is a sweet duet with Orfila, is very unique, because the lyrics take turns to interpret the love characteristics of the twelve constellations and spread widely on social media.