Hi THD, thanks for taking the time and checking Asiana flights. And I'm looking to book S-type Economy fare, from Aug 21 2013 to Jan 24 2014.

On the Asiana and Orbitz website, you can see "change fees" of the particular fare by clicking the provided link, and I C/P what it says (since it's quite long, I'm just going to bold the important parts):

FOR S- TYPE FARES OUTBOUND - CHANGES CHARGE USD 100.00 FOR REISSUE/REVALIDATION. WAIVED FOR DEATH OF PASSENGER OR FAMILY MEMBER. NOTE - VALID DEATH CERTIFICATE REQUIRED. --- IF REISSUE OF TICKET TO A HIGHER FARE BASIS IS FOR THE PURPOSE OF USING MILEAGE UPGRADE TO A HIGHER CABIN WITHOUT ANY CHANGE IN ROUTING THEN CHARGE WILL BE WAIVED. --- CHARGE APPLIES TRANSPACIFIC SECTOR FOR CHANGES TO ROUTINGS/CARRIERS/UPGRADE TO HIGHER FARE PROVIDED SUCH CHANGES ARE MADE PRIOR TO DEPARTURE OF THE TICKETED FLIGHTS. ANY CHANGE TO THE OUTBOUND TRANSPACIFIC FLIGHT -INCLUDING DATE CHANGE- WILL REQUIRE TICKET REISSUE. --- THE ITINERARY MUST BE RECALCULATED USING THE FARES IN EFFECT ON THE DATE OF TICKET REISSUE AND MUST MEET ALL RULE PROVISIONS OF THE REVISED FARES. --- IF THE REVISED FARES RESULT IN AN INCREASE THE THE DIFFERENCE WILL BE COLLECTED IN ADDITION TO THE USD 100.00 CHARGE. --- THE 100.00 CHARGE WILL REMAIN NON-REFUNDABLE AND MUST BE CARRIED FORWARD TO THE ENDORSEMENT BOX OF THE REISSUED TICKET. --- CHILDRENS DISCOUNTS APPLY. --- CHARGE DOES NOT APPLY TO INFANTS NOT OCCUPYING A SEAT.

INBOUND - CHANGES CHARGE USD 100.00 FOR REISSUE. WAIVED FOR DEATH OF PASSENGER OR FAMILY MEMBER. NOTE - --- VALID DEATH CERTIFICATE REQUIRED. --- IF REISSUE OF TICKET TO A HIGHER FARE BASIS IS FOR THE PURPOSE OF USING MILEAGE UPGRADE TO A HIGHER CABIN WITHOUT ANY CHANGE IN ROUTING THEN CHARGE WILL BE WAIVED. --- CHARGE APPLIES PER TICKET REISSUE FOR CHANGES TO ROUTINGS/CARRIERS OR UPGRADE TO HIGHER FARE. --- REISSUE FOR DATE CHANGE INCLUDING OAL PORTION WITHOUT CHANGE IN ROUTING/CARRIERS IS PERMITTED FREE OF CHARGE. --- THE ENTIRE FARE MAY BE UPGRADED TO HIGHER OZ FARES RECALCULATED FROM THE POINT OF ORIGIN PROVIDED ALL RULES PROVISIONS FOR THE REVISED FARES ARE MET. THE REVISED FARES WILL BE THOSE IN EFFECT ON THE DATE OF ORIGINAL TICKET ISSUANCE. THE USD 100.00 CHARGE WILL BE COLLECTED IN ADDITION TO ANY DIFFERENCE IN FARES. --- THE 100.00 CHARGE WILL REMAIN NON-REFUNDABLE AND MUST BE CARRIED FORWARD TO THE ENDORSEMENT BOX OF THE REISSUED TICKET. --- CHILDRENS/INFANT DISCOUNTS APPLY. --- CHARGE DOES NOT APPLY TO INFANTS NOT OCCUPYING A SEAT. CANCELLATIONS ANY TIME CHARGE USD 200.00 FOR CANCEL/REFUND. CHILD/INFANT DISCOUNTS APPLY. WAIVED FOR DEATH OF PASSENGER OR FAMILY MEMBER. NOTE - VALID DEATH CERTIFICATE IS REQUIRED. --- NOTE - WHEN 2 ROUNDTRIP FARES WITH DIFFERENT PENALTY CHARGES ARE COMBINED ON A HALF ROUNDTRIP BASIS THEN HIGHER PENALTY CHARGE APPLIES --- PARTIAL REFUND NOT ALLOWED.

So there's a difference between the outbound and inbound flights - for the outbound it says there will be a $100 fee if you change dates, but for the inbound flight it says it's free of charge if I choose to change dates. Can anyone confirm that I am interpreting this correctly?