Seoul and Jeonbuk Motors both clinched K-League play-off spots after picking up wins against Daejeon Citizen and Chunnam Dragons.
Choi Yong-Soo’s men have now won their last seven league games to earn their place in the championship round, impressively seeing off a late comeback from Daejeon.
With the hosts seemingly cruising, Kim In-Wam's strugglers fought back from 2-0 down to level through Jin-San Hwang in the 87th minute.
But their hard work was undone deep in stoppage time when defender Ko Yo-Han found the back of the net to rob the three points and seal their place in the Championship round.
Jeonbuk clinched the vital points after their visitors could not cancel out Lee Seung-Ki’s 48th-minute goal.
While bottom club Daejeon's woeful form continues ahead of the relegation play-offs, Busan I’Park and Incheon United moved one step closer to finishing in the top half of the table on Sunday.
Busan just clinched victory against Ulsan with an 83rd minute goal from Rodrigo Da Costa to keep their Championship hopes alive after a number of early draws in the season gave them an uphill task.
They face Jeju in their next game hoping to overtake them after Park Kyung-Hoon's side were held 1-1 by Daegu, moving the 1989 champions within a point of the top seven.
Incheon United have also struggled with patchy form which they remedied with a 2-1 win away to Gangwon, despite them being 1-0 down all the way through to the 80th minute.
The game was turned on its head when 23-year-old Diogo Acosta fired home a penalty, to mark his sixth goal of his debut season, before Ahn Jae-Joon rippled the back of the net ten minutes later.
The weekend also saw a number of draws with league leaders Pohang Steelers unable to break Gyeongnam.
The points were also shared in Suwon Bluewings contest with Seongnam on Saturday with Cho Dong-Geon's brace for the home team just not quite proving enough.
|Coach: Yong-Soo Choi|
for S. Escudero 63'
for Adilson 78'
|Newcastle hold talks over Northampton youngster|
|Cuadrado´s agent plays down Chelsea exit rumours|
|Liverpool´s Alberto set for Deportivo loan|
|Leverkusen suffer surprise defeat, Stuttgart hit six|
|Inter ´dismayed´ at Fiorentina vice-president´s Salah Twitter outburst|
|Blaszczykowski ruled out of Dortmund´s Asia tour|
|Gerrard gets the beers in for LA Galaxy fans|
|De Gea coy over Real links|
|Former Brazil star Carlos handed Delhi reins|
|Ciftci will not push through Celtic switch – agent|
|In-demand Mitrovic considering Roma offer|
|Lehmann calls on Cech to ´get over´ Chelsea|
|Marlos double sinks Monaco|
|Mauritius 0 South Africa 2 (agg 0-5): Bafana set up Angola qualifier|
|Keane relishing Gerrard arrival|
|Palace confirm Cabaye interest|
|Hamburg bring in Spahic after head-butt ban|
|Blatter hits out at France and Germany over World Cup votes|
|Sanchez: World Cup exit spurred Chile to Copa glory|
|Jojic makes Cologne switch, Santana move falls through|
|Carrillo keen to get going at Monaco|
|Micronesia thrashed 38-0 as Fiji triumph in Olympic qualifier|
|Schalke stunned by ´machine´ Caicara|
|MLS Review: Keane shines at Gerrard´s Galaxy unveiling|
|Counter-attacking the key for Japan|
|Jimenez happy at Atletico|
|Gerrard predicts ´successful future´ with Galaxy|
|Iniesta can´t see Real selling Ramos|
|Keshi sacked as Nigeria coach|
|Three finals, three defeats for Messi, Mascherano|
|Nani close to Fenerbahce move|
|Sampaoli revels in ´unbelievable joy´|
|Bravo: Copa victory a dream|
|Martino: Argentina should have won|
|Chile 0 Argentina 0 (4-1 on penalties): Hosts end trophy drought|
|Germany 0 England 1 (after extra time): England make World Cup history|
|Kenya 0 Ethiopia 0 (agg 0-2): Hosts sent out of CHAN qualifiers after second penalty miss|
|Dortmund put 17 past Olympians, Bremen hand out thrashing|
|Dinamo Zagreb confirm arrests of coach and club president|
|I didn´t know who Wimbledon guest Klopp was - Brown|
|LeBron James backs Liverpool captain Henderson for FIFA 16 cover.|
|Ramos: I am not negotiating with anyone|
|Valencia complete Mina swoop|
|United States v Japan: US seek final redemption|
|Hanousek consigns Celtic to defeat|
|Roma confirm Dzeko interest|
|Arsenal forward Podolski completes Galatasaray switch|
|Warm Dortmund welcome delights Tuchel|
|Silva vows to fight for Madrid place|
|Mancini hints at Shaqiri and Santon departures|
|Bojan raring to go after return from injury|
|Babel backs Firmino to shine at Liverpool|
|Falcao must wait to impress, warns Chelsea favourite|
|Bartomeu: Deal in place for Turan|
|Parejo re-signs with Valencia|
|MLS Review: Sounders return to winning ways|
|Klinsmann unhappy with USA performance|
|High hopes for Paraguay - Diaz|
|Gareca: More to come from Peru|
|Gerrard had European offers|
|Argentina out to spoil Chile´s party - Martino|
|Sampaoli: Chile won´t change style|
|Di Maria will come good at United - Rojo|
|Peru 2 Paraguay 0: Gareca´s men finish third at Copa|
|United States 4 Guatemala 0: Klinsmann´s men win comfortably|
|´I’d prefer no-one to know my name´ - Bassett|