Busan is the only TERPS airfield I've looked at doing the circ approach for, ie done the sim training and flown into the airfield but have only used the straight in approach for real. Zeffy is right about timing, for my operator we do time the downwind but more importantly there is a stored waypoint in the FMS database which we must not fly past.
Training was great fun not sure I want to fly the approach for real.
A320 with flap 3 downwind flap full selected before the base turn.