"I am happy because I am playing, and that is very important as far as the World Cup goes.
"If I had stayed at Lyon, I would not have had the chance to prepare for the most important tournament of my life."
Engel has been preaching a line of cautious optimism for the finals, where they face Portugal, the US and South Korea in their group, and Bak is no different.
"On the one hand," he said, "our group is not the most difficult, but on the other there are no easy games in such a tournament.
"Let's look at it rationally. Portugal are the best side, and have to qualify.
"South Korea will also be very dangerous because the host team always are.
"Those two teams will be the biggest threats to us, but I'm sure that if we can keep going as we have been, we will perform well."