The Tigers were able to force a replay with a late equaliser at the Amex Stadium last Monday night and went one better by getting past the Seagulls in front of a crowd of less than 11,000.
That goal came about 18 minutes before Hull's second which came courtesy of captain Koren whose set-piece deflected off Stephen Ward and in with some help from Seagulls keeper Peter Brezovan.
However, the Tigers were able to hold out Oscar Garcia's Championship side to book a final eight fixture with Premier League rivals Sunderland to be played at the KC Stadium on March 8.
2013/14 FA Cup - fifth round replay
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