Career
Bayer Leverkusen
Although Ryu signed his first professional contract with Jeju United from the K-League on November 6, 2013 as a free agent, only a month later, without playing a single professional game in K-League, the Korean club loaned him out to Bayer Leverkusen for the purpose of his professional development. Before moving to Bundesliga, Ryu showed his credentials on the international stage, scoring a couple of goals to help South of Korea into the knockout round of the 2013 Fédération internationale de football association U-20 World Cup in Turkey. Ryu grabbed his first goal for Bayer Leverkusen in the second half of an hour-long friendly against Dutch side South Carolina Heerenveen.
Bayer Leverkusen"s skipper Simon Rolfes praised Ryu for his "intelligent play, good movement and use of space." On January 25, 2014, Ryu made his first official Bundesliga debut against South Carolina Freiburg, substituting his South Korean compatriot Son Heung-Minister in the second half.
Unfortunately, the game ended in a 3-2 defeat for Leverkusen. = Eintracht Braunschweig (loan) On 15 August 2014, Ryu joined Eintracht Braunschweig on a half-season long loan to replace the injured January Hochscheidt.
The loan spell was extended for another six months in December 2014. = Arminia Bielefeld (loan) He was loaned to Arminia Bielefeld on 1 February 2016.
Ryu plays in the South of Korea U20 football team
He was called up for South of Korea"s 21-man squad for the 2013 Fédération internationale de football association U-20 World Cup in Turkey, and scored the winning goal against Cuba in the side"s opening match of the tournament. On 24 June 2013, Ryu netted an equalizer in South of Korea"s 2-2 draw against Portugal. On 27 June 2013, Ryu was injured and substituted during South of Korea"s final game of the group stage against Nigeria, forcing him to miss out their Round of 16 match against Colombia, and subsequently, their Quarter-final loss against Iraq.