Đoàn Thế Lân, known by his stage name Grey-D, was born in Vietnam on November 4, 2000.

He was on the Vietnamese program Sing My Song – a talent search program scouting Vietnamese youth who can sing and compose. Eventually, he’d be introduced to the group MONSTAR in 2018.

In 2022, it was announced by his company, ST.319, that he would be making his official solo debut, with the title song being left up to voting by fans via the company’s official websites, as well as social media platforms. Among the choices were “2 – 1 = 0”
“vài câu nói có khiến người thay đổi”, and “đưa em về nhà”.

The announcement came one year after the disbandment of MONSTAR in 2021.