The 22 year-old defender is set to undergo a medical in the coming days and will join compatriot Park Ji-sung at Loftus Road once his work permit application is accepted.
After being linked to a number of European clubs, Yun is delighted to be nearing a move to England and hopes to make an immediate contribution at QPR.
"I've wanted to play in the Premier League for a long time," he told The Korea Herald.
"I am only focused on making quick adjustments to English football and giving everything I have to become a successful defensive back in the Premier League."
Yun will become the 11th South Korean to ply his trade in England's top-flight should his transfer go through.