Yoo "Ryu" Sang-wook (Hangul: 유상욱) is the mid laner for 100 Thieves.
Yoo "Ryu" Sang-wook began his career as the mid laner for StarTale in March of 2012. StarTale played in Azubu The Champions Spring 2012 but they failed to make it through the group stage. Soon after, Ryu switched roles to jungle after the addition of 5cean and Fine. At Azubu The Champions Summer 2012, StarTale actually made it out of groups but ended up losing in the quarterfinals 2-0 to NaJin Sword. StarTale disbanded in August with Ryu, Joker, and Mafa joining the new KT Rolster B roster.
KTB played in their first major tournament together at OLYMPUS Champions Winter 2012-2013 and ended in third place after losing two sets, 3-1 and 3-0, to Sword but beating Azubu Blaze 3-0. KTB didn't do as well in OLYMPUS Champions Spring 2013, losing 3-1 to MVP Ozone. A little later, KTB and their sister team, KT Rolster A, were renamed to the KT Rolster Bullets and the KT Rolster Arrows. HOT6iX Champions Summer 2013 was the breakout season of the Bullets, making the finals and playing one of the best series of League of Legends ever against SK Telecom T1. Unfortunately for the Bullets, they lost a close 3-2 set against SKT. The Bullets had enough circuit points to qualify for the Season 3 Korea Regional Finals but they met SKT again in the finals, this time losing 3-1. KTB missed the Season 3 World Championship even though they were considered the second best team in the world at the time.
KTB placed third again at PANDORA.TV Champions Winter 2013-2014 after losing 3-0 to SKT K in the semifinals but beating NaJin White Shield 3-1 in the third place match. Although the Bullets weren't considered a very strong Korean team at the time, they managed to sweep the IEM Season VIII World Championship, culminating in a 3-0 victory over Fnatic. They came back to Korea to participate in HOT6iX Champions Spring 2014 but they were knocked out of the quarterfinals 3-2 by NJWS. Shortly afterwards, Ryu was moved to the jungle again. The Bullets bombed in HOT6iX Champions Summer 2014, missing the playoffs for the first time in the team's history. Ryu was released from the team about a month later.
Ryu and H0R0 joined Millenium in October 2014 to play in the European Expansion Tournament. Millenium received a bye for Round 1, but were eliminated from the tournament in Round 2 after being beaten by GIANTS! Gaming. After that defeat, Millenium disbanded. Ryu then subbed for Team ROCCAT at IEM Cologne after the team were invited due to Fnatic not being able to attend. They were knocked out in the semifinals, losing to Counter Logic Gaming. Ultimately, Nukeduck filled ROCCAT's midlane spot; Ryu instead joined H2k Gaming to play in the EU LCS, filling the spot opened by Febiven joining Fnatic.
The Spring Split itself was relatively successful for Ryu and H2k-Gaming. After a shaky start, results began to pick up for the team, partly thanks to the introduction of kaSing to the roster. Ryu's impressive individual performances throughout the rest of the split, on a range of champions, helped the team to a 3rd place finish in the regular season. In the Spring Playoffs, Ryu and the team beat Copenhagen Wolves in the quarterfinals, but were beaten in the semifinals in a close-fought series by eventual champions Fnatic. H2k-Gaming went on to pull off a shock victory over SK Gaming in the 3rd place match, securing themselves 50 Championship Points.
Ryu and the team began to impress from the very start of the Summer Split. H2k-Gaming jostled for 2nd position with Origen throughout the regular season, with Fnatic way out in 1st place throughout. Impressive performances from Ryu, again on a wide range of champions, ultimately helped the team to yet another 3rd place regular season finish. The Summer Playoffs also went well for Ryu and the team, beating Giants Gaming in the quarterfinals of the tournament. The were beaten in the semifinals by Origen, but went on to beat Unicorns Of Love in the 3rd place match, securing the team 70 Championship Points, which meant that the team had qualified for the 2015 World Championship as Europe's #2 seed.
At the 2015 World Championship, H2k-Gaming were seeded into Group C along with SK Telecom T1, EDward Gaming, and Bangkok Titans. They picked up 2 wins in the group, both coming against BKT. Ryu and the team finished the group in 3rd place, meaning they would not advance to the knockout stage of the tournament.
At the start of the season, H2k-Gaming were voted to play at IEM Season X - Cologne. They fielded a roster including Odoamne and Ryu from their 2015 roster along with new members Jankos, FORG1VEN, and VandeR. The team beat Cloud9 in the quarterfinals but were then beaten themselves by eventual winners Ever in the semifinals of the tournament.