Signed to 'Pirates of Space' (P.O.S) from the 2006 draft at the young age of 16, Lee Jae Ho made his first TV appearance in Proleague the following month. Despite statistics of 3-7 he showed considerable promise with a dominating performance against Anytime. In the second half of the Proleague season Jae Ho became one of the strongest members of MBCGame Hero. Destroying his first 4 opponents with ease earned him much respect within the team and was even used for Ace on a number of occasions.
Shortly after the 1st season of the 2006 Proleague he participated in the i-Station Dual tournament and qualified for 2006 Shinhan Bank OSL Season 2. Despite losing 0-3 in a tough group (Eventual winner NaDa, an in-form ZergMaN and jy) he continued to show strong performances in the 9th MBC Movies Survivor League and qualified for the 2006 GOMTV MSL Season 1. In the 2nd OGN Dual Tournament Jae Ho showed an amazing performance finishing 1st from his group and qualifying for 2006 Shinhan Bank OSL Season 3. However, once again he met an insane group (eventual winner sAviOr, 2nd place NaDa and firebathero and departed 0-3.
Through his efforts in the latter half of 2006, Jae Ho earned the nickname "Dark Sorcerer" for his unparalleled multitasking which could only be achieved through some kind of dark magic. It was this amazing multitasking that Coach Ha originally saw in Jae Ho when he signed him onto P.O.S and this feature of Jae Ho was brought out very nicely by him. Using his amazing multitasking, he was able to turn the TvZ balance on Arcadia from deeply in Zerg's favor to strongly in Terran's favor. This also was considered an amazing feat, and his methods on the map were copied extensively by other Terrans.
Jae Ho would build on his 2006 success in 2007 by placing first in his group in GOM TV MSL and making his way to the tiebreak round for entry into the semifinals losing a close match 1-2 to Hwasin. Jae Ho earned himself the 6th seed for GOM TV 2 MSL, and came 1st in his group. Jae Ho would lose to eventual finalist and teammate Bisu in the first round and again to the other finalist Stork in the first round of the wildcard matches. Jae Ho also qualified for Daum OSL where he lost 1-2 to another tough group.
For his entire career Light has been known for his top class TvZ, but his weaker TvP has prevented him from advancing farther in Starleagues. His deepest Starleague run to date was in the 2010 Bigfile MSL, where he defeated EffOrt 2-1 to advance to the semifinals against Jaedong. In a close series, Light displayed his phenomenal late-game play in games 2 and 3 to take the lead. However, he was shaken by Jaedong's unorthodox mass muta-queen build in the 4th set and subsequently failed to defend an aggressive 2 hatch mutaling in game 5 to lose the series 2-3.
After Light finished his military service in September 2015 he started streaming again on Afreeca. So far Light's only tournament appearance was in Afreeca Starleague Season 2 for which he qualified in the Busan Qualifier by defeating Shine after getting eliminated by Soulkey in the Seoul qualifier. In ASL 2 Light was seeded into Group B, which included EffOrt, Rain and Force[Name]. After losing the Opening Match vs. EffOrt and winning the Losers Match against Force[Name] Light managed to advance to the Ro 16 in second place behind Rain by defeating EffOrt in the Deciders Match. His group in the Ro 16 consists of him, last season's champion Shuttle, newly returned Stork and GuemChi.
The table shows Light's overall record as of May 4, 2013:
- After his retirement in September 2013, Light did not join the SoSPA scene immediately but dedicated some of his free time on the weekends to streaming his play on AfreecaTV and produced a series of Terran strategy guides on his blog. These were translated into English by juki. 
- Has one of the scariest TvZ of 2010. Going 21-2 (91.3%) which nearly matches iloveoov's 33-3. (As of July 31th 2010). During Winners League, he actually remained unbeaten against Zerg opponents.
- Jaedong, possibly the best ZvT player ever, accounts for 12 of Light's 49 TvZ losses, which is about 24% of all of Light's TvZ losses.
- Light won the 2006 OnGameNet Super Rookie Tournament, defeating Justin 2-1 in the final.
- Light had some of the strongest showings in the 08-09 Proleague, finishing with the result of 36 wins and 17 losses.
- Light had the most wins in the '10 Winner's League.
- Shinhan Bank Winners League 09–10, Week 3 Day 1 — vs. Air Force ACE:
- ▣ vs. Cloud on Neo Tornado, 1st set ; ▣ vs. Reach on Roadrunner, 2nd set ; ▣ vs. Darkelf on Neo Moon Glaive, 3rd set ; ▣ vs. Much on Match Point, 4th set
- Shinhan Bank Winners League 09–10, Week 5 Day 4 — vs. SK Telecom:
- ▣ vs. Best on Neo Tornado, 1st set ;▣ vs. Fantasy on Roadrunner, 2nd set ;▣ vs. Canata on Neo Moon Glaive, 3rd set ;▣ vs. Bisu on Match Point, 4th set
- Shinhan Bank Winners League 09–10, Week 6 — vs. eSTRO:
- ▣ vs. Hyvaa on Match Point, 2nd set ;▣ vs. Action on Fighting Spirit, 3rd set ;▣ vs. SangHo on Judgement Day, 4th set ;▣ vs. Really on Neo Tornado, 5th set
- Shinhan Bank Winner's League 2011, Round 3 Week 3 - vs. WeMade FOX:
- ▣ vs. RorO on La Mancha, 1st set ;▣ vs. herO(jOin) on Benzene, 2nd set ;▣ vs. BaBy on Icarus, 3rd set ; ▣ vs. Midas on Circuit Breaker, 4th set
- Light vs sAviOr, Daum OSL, Monty Hall (Pimpest Plays 2007) - sAviOr tries to rush Light, but is blocked by a timely built Supply Depot. A wild game ensues.