Ulsan have a very good run, but the schedule has been very busy in this period and they are between two very important ACL games against Suwon. In these conditions, I expect their coach to make changes because the Suwon's return leg is much more important in this moment especially after getting the right result in the first leg.
Despite being a newly promoted side Gyeongnam did very well so far and were second before the round started. The away side is vulnerable at the back, but are strong going forward with the powerful Brazilian forward Marcao being in the spotlight. I think Gyeongnam can stay undefeated in this one.