[6] The Wolverhampton manager at the time, Glenn Hoddle, preferred Seol as one of his first-choice forwards,[6] using him in various roles such as striker, attacking midfielder and winger.

[7] Disappointed by the failure of Wolves' promotion, Seol sought Premier League clubs interested in him before the 2006 FIFA World Cup despite having two years left on his contract.

"[8] Seol eventually joined newly promoted Premier League club Reading on 12 July 2006 for a reported transfer fee of £1.5 million.

[9] He was voted the Reading Player of the Month for August by fans after showing great performances early in the season.

He scored his first goal for Fulham in a 2–1 defeat to Hull City on 16 August 2008,[16] but he still didn't show something special the next season.

[18] Seol scored his second goal for the club in a Europa League qualifier against FK Vėtra on 30 July 2009, but he failed to made a twist for his status.

[20] Seol played for Pohang Steelers, Ulsan Hyundai, and Incheon United in the K League after leaving Fulham.

In a global Nike advertising campaign in the run up to the 2002 World Cup in Korea and Japan, he starred in a "Secret Tournament" commercial (branded "Scopion KO") directed by Terry Gilliam, appearing alongside football players such as Thierry Henry, Ronaldo, Edgar Davids, Fabio Cannavaro, Francesco Totti, Ronaldinho, Luís Figo, and Hidetoshi Nakata, with former player Eric Cantona the tournament "referee".