Mạnh-Long was born on December 26th, 1967 in Hoa-kỳ. Mạnh-Long's father was Liễm and his mother is Phượng Hoàng Thái. His paternal grandparents were Lê and Ngọc Phạm thị. He had two brothers named Mạnh-xuân and Việt. He is the oldest of the three children.