Cho "H0R0" Jae-hwan played for Xenics Storm as a jungler in early 2012. They competed in Azubu The Champions Spring 2012 where they ended in third place after losing 3-2 to MiG Frost in the semifinals but beating Team OP 2-1 in the third place match. H0R0 left in May to form a team of his own, Tempest. The team only competed in NLB Summer 2012 where they lost 4-1 to MVP White in the finals.
Tempest was picked up by Xenics Storm again in November but he left the team in December to join Eat Sleep Game. The roster was sponsored by SK Telecom to become SK Telecom T1 1. SKT competed at IEM Season VII - Global Challenge Cologne where they beat Fnatic 2-1 in the finals. Shortly after this, H0R0 renamed himself to Beelzehan. SKT's victory at IEM Cologne qualified them for the IEM Season VII - World Championship where they lost 2-0 to CJ Entus Blaze in the semifinals. SKT played in GIGABYTE StarsWar League Season 2 but they placed last in their group. SKT renamed to SK Telecom T1 1 when the org created SK Telecom T1 2. SKT 1 went to OLYMPUS Champions Spring 2013 but they lost 3-0 in the quarterfinals to CJ Blaze. Everyone but Beelzehan left SKT T1 1 in June of 2013 which is when he changed his name back to H0R0. H0R0 joined SKT 2 as a sub for HOT6iX Champions Summer 2013 but he did not play for them. A new roster for SKT T1 1 was announced in October featuring H0R0, MaRin, Eazyhoon, Bang, and Wolf.
SKT T1 1 and SKT T1 2 were renamed to SK Telecom T1 S and SK Telecom T1 K in November of 2013. SKT S qualified for PANDORA.TV Champions Winter 2013-2014 where they failed to make it past the group stage. At HOT6iX Champions Spring 2014, S failed to make it out of groups once again. The team's best result came at HOT6iX Champions Summer 2014 where they made it to the semifinals but ultimately placed 4th after losing 3-2 to the KT Rolster Arrows and then being swept 3-0 by Samsung White.
On October 24th 2014, it was announced that H0R0 joined Millenium together with Ryu. Here, he participated in the 2015 EU LCS Spring Expansion Tournament. Millenium received a bye for Round 1, but were eliminated from the tournament in Round 2 after being beaten 2-1 by Giants Gaming.
H0R0 left Millenium in December to join MeetYourMakers. The 2015 EU LCS Spring Season was largely unsuccessful for him and the team, though they were refreshed by the additions of Jwaow and NoXiAK. Despite a great improvement in performances for the team towards the end of the split, they finished in 10th place after a tiebreaker loss to Giants Gaming and were autorelegated. MYM disbanded in June of 2015.
In July, H0R0 joined Unicorns Of Love as a substitute, moving onto the starting roster for the 2015 EU LCS Summer Playoffs. H0R0 and the team overcame Team ROCCAT 3-2 in the quarterfinals but were taken out 3-0 in the semifinals by a dominant Fnatic. 40 Championship Points gained here secured Unicorns Of Love a spot in the 2015 Season Europe Regional Finals. Despite their high seeding, they were beaten 3-0 by Origen in the final of the gauntlet. H0R0 left Unicorns Of Love at the end of the season.
H0R0 rejoined UOL as a sub in January of 2016