Jeremy Lau (柳應廷; born 20 November 1992), professionally known as Jer, is a singer and actor based in Hong Kong. He became a member of the Hong Kong boy group Mirror after finishing in the top 20 of ViuTV's reality talent competition "Good Night Show - King Maker" in 2018. His debut single, the soft rock ballad "Water Story" (水刑物語) was released on February 29, 2020.