Hieu Duc, 24, studies graphic design and has a passion for bodybuilding.
He won many prizes in male pageants, including a silver medal in Menphysic 2017 whilst also achieving a Top 5 finish in Vietnam Fitness Model 2017.
He has spent several months preparing his skills ahead of the global pageant.
Mister National Universe 2019 will take place in Thailand from June 24 to July 1. The final night is due to trán in Hua Hin city on July 1.