Ryu Seung -woo played as a winger for the Chung- Ang University. Ryu also plays in the U-20 national team. He scored in the discharged in Turkey U- 20 World Cup 2013 in the group matches against the selection of Cuba in 83 minutes and against the selection of Portugal in the 45th minute, depending on a gate.
In July 2013 the media reported an obligation by the Bundesliga club Borussia Dortmund for less than € 500,000 transfer fee. Ryu denied briefly that there was already an agreement, and the BVB declared on 23 July that he would waive the obligation.
Since November 6, 2013, is at Jeju United.
On 18 December 2013, the Bundesliga club Bayer 04 Leverkusen gave Ryu's obligation for one year on loan known, then there is a purchase option. His league debut came on 25 January 2014 ( 18th Round ) in the 2:3 defeat in the away match against SC Freiburg with Substitutes for Son Heung- min in the 83rd minute.