I don't know if it has been mentioned in this thread, but on 788 in WT seats 20DEF and 21 ABC HJK are bulkhead extra legroom seats. Since these are bassinet seats they can't be allocated online, recently called in about T-60 and got 21A on LHR-ICN.
Plenty of legroom (I'm 6'2"), but but seats are narrow and armrests don't lift.
If you're in 21ABC or HJK don't store your bag to locker above the seat. When curtain is closed between WT and WTP it blocks the locker and you can't access the bag until after landing.