The midfelder, capped 65 times by South Korea, has made an impressive start to life in the Premiership at Reading, scoring key goals against Sheffield United and a 30-yard piledriver to take maximum points at West Ham.
Seol kicked-off his career in European football with spells at Royal Antwerp and Anderlecht in Belgium before joining Wolves in 2004-05. He hooked up with Championship champions Reading for their assault on the Premiership this season.
"He's a great player and I know him very well, he's my room mate when we join up with South Korea," said Young-Pyo, who returned from injury against Port Vale on Wednesday.
"Just last week we got together for dinner because it was his daughter's birthday.
"He's had a great start to his first season in the Premiership. He's a very dangerous player and we will have to be aware of him in the match, he has a powerful shot with either the left or right foot, he's a great crosser of the ball, physically strong and fast.
"His start is no surprise to me and I think he will get better match by match. We will have to watch him."
Lee Young-Pyo has warned us about Reading's potential dangerman Seol Ki-Hyeon - and as his international room mate, he should know!