Jan Vertonghen's goal 12 minutes from time was enough to give Belgium the win and end South Korea's hopes of progression.
Myung-bo was full of praise for the effort of his players, as he took responsibility for their campaign.
"My players gave everything they had. They made some mistakes, but also produced a lot of good things," he said.
"We played pretty well overall, creating chances on the counter-attack.
"The nature of the match changed after Belgium had a man sent off. We probably held onto the ball for too long in midfield. I take responsibility for the result."
On his own future he added: "I’ve done my best – my World Cup objective was to not have any regrets at the end. I’m going to take a little bit more time before deciding on my future."