Park, signed by Sir
But the midfielder has opted to move to QPR, which only escaped relegation on the final day of last season, despite other offers from England,
"It was a very difficult decision, it's hard to leave such a big club, but QPR showed me what they are trying to be," he said. "It is time for a new challenge.
"QPR want to be a bigger club, they want to improve and it's a great challenge. It was a difficult decision but they have great players and they are hungry to get to the next level. It's not about the money.
"I am joining a club that is very much on an upward curve, a club that has a very bright future.
Park is QPR's sixth signing of the northern summer, joining
The ambitious club also claims his signing will 'put the QPR brand on a global scale', heading up its attempts to break into the Asian market.
Hughes said: "On a football level Ji is someone I have admired from afar for years.
"He wore the red shirt of Manchester United in a distinguished way and he will bring a great deal to the team, I can't wait to start working with him.
"Ji is a motivated guy, he feels there is success ahead of him, he ticks every box. It's a very exciting time for QPR.
"He's very adept in a number of positions. What he brings to the team is technical ability, a huge work ethic and a winning mentality.
"He understands what it takes to win trophies and to win matches, and I want to take that from Ji and pass it to the rest of the team.
"I said at the end of the season we didn't want to be in the same position next season and I stand by that, we are in a better place now."