Mariners, Seongnam dive into the unknown once again, with Group G wide open after a tight first two matchdays
As it often is in the AFC Champions League, the meeting between the Central Coast Mariners and Seongnam Ilhwa is uncharted territory.
Seongnam need little introduction to continental competition, however, winning the 2010 ACL and finishing runners-up in 2004.
They will prove a tough ask for the Mariners when they visit Bluetongue Stadium on Tuesday, whose only two experiences against K-League opposition - in the form of Pohang Steelers - ended in a 3-2 loss and a 0-0 draw in the 2009 ACL.
The Mariners are not without their concerns at present. Having just clinched the A-League's Premiers Plate, they then slipped 2-0 to rivals Brisbane Roar in the first leg of the major semi-final on Saturday.
The reading is hardly better for Seongnam, however. With just one win in their last five matches in all competitions, former Queensland Roar assistant Shin Tae-Yong's men are in 14th place and just two spots from the bottom.
They are on top of Group G by virtue of goal difference, though only because every match in the group has finished a draw.
In good news for the Mariners, they have a clean bill of health. Seongnam will likely be missing one face familiar to Australian football, with Socceroos defender Sasa Ognenovski struggling with a hamstring injury.
The gamble of Central Coast coach to pair teenage attacking midfielders Tom Rogic and Mustafa Amini backfired against the Roar, so Daniel McBreen may be included in the starting XI.
Everton Santos has been one of the few shining lights for Seongnam, having scored four goals from five starts in the K-League. The former Paris Saint-Germain and Corinthians frontman's partnership with countryman Heverton is one feature of the Mariners' opponents that will concern Arnold.