Jeonbuk Hyundai Motors have sealed the capture of highly-rated Song Min-kyu from K League 1 rivals Pohang Steelers on a four-and-a-half year deal.
With all four of their representatives through to the knockout round, South Korea looms as a dominant force in AFC Champions League 2021.
As the AFC Champions League group stage reaches its final matchday, we take a look at which teams have progressed and which are on the brink.
Johor Darul Ta'zim and Ratchaburi Mitr Phol bowed out of AFC Champions League 2021 on a whimper as a goalless draw epitomised their campaigns.
Former powerhouse Nagoya Grampus notched another win and became the first club from the East Zone to secure a berth in the knockout rounds.
2020 winners Ulsan Hyundai have lived up to top billing in the AFC Champions League, but Kawasaki Frontale and Nagoya Grampus have also impressed.
The ASEAN contenders of AFC Champions League 2021 had a Thursday evening to forget, losing three of four matches and conceding 15 goals in total.
Tampines Rovers come up against the might of Jeonbuk Hyundai Motors on Thursday, so do they have any chance of pulling of an upset?
All five groups in the AFC Champions League East Zone group stage are now underway, so which of the 20 teams have made the best impression so far?
Guangzhou Evergrande could have sealed a knockout berth with a win over Suwon but will now need help from Vissel.
Andres Iniesta was brilliant as Vissel Kobe secured passage to the knockout rounds with a win over Guangzhou Evergrande.
Sydney FC are once again set to miss out on the Asian Champions League knockout stage after a 1-0 loss to Jeonbuk Hyundai.
Shanghai SIPG FC looked to their bench to top Jeonbuk as the K League 1 champions lost their second AFC Champions League match of the tournament.
The 41-year-old striker for Jeonbuk Motors will play in his final match on Sunday after 23 years.
The first round of games of the K-League season ended on Sunday, giving the rest of the world an idea of how football may feel in this new reality.
Sydney FC's luck run out late as 10-man Jeonbuk Hyundai Motors conjured a deserved last-minute equaliser for a 2-2 draw in the AFC Champions League.
Jose Morais will take over as head coach at Jeonbuk Hyundai Motors after long-serving incumbent Choi Kang-hee departs at the end of the season.
Jeonbuk, 21 points ahead of Suwon in South Korea's K-League, had been expected to win but conceded three goals in the final 15 minutes.
From Premier League flop to South Korean record-breaker, the career of Lee Dong-Gook, 38, has been full of ups and downs, writes John Duerden.
The Court of Arbitration for Sport has blocked Asian Champions League winners Jeonbuk Motors from defending their title because of a bribery scandal.
Jeonbuk Motors will not be able to defend the Asian Champions League title they won last year after being disqualified for the 2017 edition.
Thai champs Muang Thong United have boosted their squad for the 2017 AFC Champions League campaign by signing veteran South Korean midfielder Lee Ho.
A-League side Adelaide United have been drawn into Group H of the AFC Champions League where they will face reigning champions Jeonbuk Motors.
A brace from Silvio Romero saw Mexican side Club America set up a match with Real Madrid in the Club World Cup semifinals.