Heo "WonSeok" Won-seok originally played for MiG Blitz under the name Wonseok as a mid laner during HOT6iX Champions Summer 2013. The team had a decent showing but failed to make it past the group stage. He left the team in October to join Samsung Blue as a mid laner when he changed his name to "PawN". PawN made a name for himself in the 2013 WCG Qualifiers when he managed to solokill Faker in lane.
PawN played his first OGN with his team at PANDORA.TV Champions Winter 2013-2014 where they managed to make it to the quarterfinals but were swept 3-0 by the eventual champions, SK Telecom T1 K. Later, PawN became the mid laner for Samsung Ozone or Samsung White, switching teams with Dade. At HOT6iX Champions Spring 2014, PawN and his new team would run into Blue in the semifinals and fall to them 3-1 but they would beat CJ Entus Blaze 3-2 to end in third place. Once again, at HOT6iX Champions Summer 2014 White would face blue in the semifinals and again they would lose 3-1. White would go on to sweep SK Telecom T1 S to place third for the second time in a row. White was forced to play a tiebreaker against SKT K for the second seed in the 2014 Season World Championship. White dominated SKT, sweeping the series and taking their spot at Worlds. PawN and crew rolled through the Worlds, only dropping two games and ending it on a dominating 3-1 victory against Star Horn Royal Club to seal the Championship. For much of his time on SSW, he would play a more passive style while the rest of the team carried. Later on during his tenure on the team, he would begin playing a more lane dominant style with champions like Jayce and Talon. He became known to some as Faker's kryptonite, or the "God slayer" for solo killing him in lane.
On October 31st 2014, PawN announced his departure from Samsung White. On December 2nd, he joined EDward Gaming. PawN and the rest of the team 3-0'd EDG's biggest offseason rivals, Team King at the G-League 2014 final when he made his first appearance as the squad's mid laner.
Edward Gaming placed first in the 2015 LPL Spring regular season with PawN as the starting mid laner. In 44 regular season games, PawN played 42 due to illness. PawN also played for the team during 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. During this period, PawN specialized in a wide range of champions from Veigar to the more conventional Kassadin and Leblanc. He played 18 different champions in 42 regular season games. His playstyle morphed into a more lane focused, jungle attention seeking role. At times, it seemed he chose immobile champions to make himself an easy target for the jungler. At the start of the 2015 Spring LPL Playoffs, PawN fell ill. Pain in his back prevented him from attending the quarterfinals against Team WE, and he was sent to the hospital. EDG went up two games before losing the next two. After the first loss EDG experienced, PawN reportedly asked to be taken to the LPL stadium. He played for the team in Game 5 for a victory, allowing them to advance to the semifinals. He continued to play for the team through the finals, where EDG won 3-2 against LGD Gaming and won their spot 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.
After a rocky start to the 2016 season, EDG returned to form and received second place in their group. PawN had been slipping in and out of the starting roster, with Athena taking his place when his injury didn't allow him to play. However, toward the end of the season, PawN played most of the games and until the playoffs. In the semifinals, the Qiao Gu Reapers forfeited their match, and they were to play Royal Never Give Up in the finals. EDG lost 1-3 to RNG, and received second in the Spring Season.
During the offseason, PawN stepped down from the starting roster, and Scout was set to replace him as the starting midlaner.