Outbound schedule has been improved. In winter season,
OZ224 2025-2020
In summer season,
OZ224 2150-2300
I bet Asiana is still looking for adjusting summer schedule, too. It's far away for now, though. And Asiana will add shuttle services to NJ and PHL in the evening on top of the current mid-day shuttles (technically free but there's a mandatory $5 tip which is still extremely cheap and convenient).