New waiver was added today. It seems to cover North America to/from/through South Korea.

Tickets must have been issued prior to 2/25 for travel up to 6/30.

Change fee and fare difference will be waived for flights rescheduled through 5/31. Change fee only will be waived for flights rescheduled for June (must pay fare difference).

It seems there is no refund being offered at this time.