Kim "Deft" Hyuk-kyu made his debut in the competitive scene when he joined MVP Blue as their new AD carry in February of 2013. His first professional tournament was OLYMPUS Champions Spring 2013 in which Blue failed to make it through their group. Blue was able to attend HOT6iX Champions Summer 2013 but Blue failed to make it through groups again. Blue and their sister team, Ozone, were picked up by the Samsung organization to form Samsung Galaxy Blue and Samsung Galaxy Ozone, respectively.
The new Samsung Blue team played in PANDORA.TV Champions Winter 2013-2014 and they finally made it to the quarterfinals but were stopped by the undefeated SK Telecom T1 K. The competitive experience Deft acquired in these seasons allowed him to develop into one of the sharpest AD carries Korea offers. His Blue teammates could not ask for a better player at the position, as they victoriously marched towards HOT6iX Champions Spring 2014 where they overcame sister team Samsung White 3-1 in the semifinals on the way to the 2014 OGN Summer Finals. Blue ended up beating NaJin White Shield 3-1 in the finals to win their first OGN title. Blue also made the finals of HOT6iX Champions Summer 2014 but they actually ended up losing 3-2 to the KT Rolster Arrows. Samsung Blue had enough circuit points to attend the 2014 Season World Championship as the top seed from Korea but they lost 3-0 in the semifinals to White. In his solo queue adventures, Deft favors Ezreal and Lucian, but he has shown to be able to play any role at the top of the Korean Challenger solo queue circuit. During his tenure on Samsung Blue, Deft favored skill shot based AD carries over auto attack based and was noted for his ability to react and dodge. In particular, he had a strong reputation as a Corki and Kog'Maw player. At the 2014 World Championship, Deft was noted for doing an absurd amount of damage to champions per game.
On October 31st 2014, Deft announced his departure from Samsung Blue. Ten days later, he announced that he had joined EDward Gaming. In his first games with EDG, the team won a convincing 3-0 over the team's biggest offseason rivals, Team King in the G-League 2014 finals. EDG played in the 2015 Demacia Cup Spring where they went undefeated from the round-of-sixteen until the finals which ended in a crushing 3-0 victory against Invictus Gaming.In 2015 LPL Spring, Deft played all 44 games with Edward Gaming. The team placed first in the regular season, losing only six games in total. He played 11 different champions, but primarily specialized in Corki, Sivir, and Jinx. He struggled the most on Kalista and Urgot. In the LPL Finals, Deft would notably end Game 5 against LGD Gaming with a pentakill, clinching EDG's spot to represent China at the Mid-Season Invitational. At MSI, EDG pushed their way to the finals and upset the heavily favored SK Telecom T1 by baiting Faker into picking LeBlanc and picking a comp to counter it. EDG won the series 3-2 and took home the title of best team in the World. EDG participated in the 2015 Demacia Cup Summer Season where they won again by taking a 3-0 set against OMG. They ended in first place once again in the 2015 LPL Summer Regular Season but in the 2015 LPL Summer Playoffs they faltered, dropping a 3-0 set to LGD and a 3-1 set to IG to end in fourth place overall. They still qualified for the 2015 Season China Regional Finals and managed to take the second seed from China to the 2015 Season World Championship with a 3-1 victory over IG. EDG were placed in a group with SK Telecom, H2k Gaming, and the Bangkok Titans. They came out of the group in second place and were drawn to play Fnatic in the quarterfinals but lost to them 3-0.