Can somebody please advise...
Which F product is offered on DFW-ICN?
Is it the Kosmo Suite or the Kosmo Sleeper? (Or something else?)

I thought I could try by booking a Guest seat in economy and viewing the seat map (look for existence or absence of row 53) but the booking wouldn't let me select an economy seat.
As far as I can tell there's no distinction between the 2 configurations when selecting an F or J seat in the booking process online as Guest.