Former defender delighted to get his man despite top-flight interest and believes that the midfielder could go on to be the "next big thing in South Korea"
The 22-year-old attacking midfielder has arrived at the Cardiff City Stadium on a three-year deal, despite reported interest from Celtic and Borussia Dortmund.
The former defender hailed the South Korea international, claiming that he could go on to become the "next big thing" in his homeland, and even further afield.
"There was strong interest from others and a Premier League club stepped in last week but the player had already committed to Cardiff by then and we were absolutely delighted by that," Mackay told Wales Online.
"We have had strong recommendations from our contacts in South Korea, including an English coach, because Kim is an up-and-coming force.
"This one is really exciting. Kim is going to be the next big thing out of South Korea and will win many international caps for his country.
"He has the potential to be something special."