Korean Air - $10,584 (online booking)
Lotte World Hotel - KRW320,000 per night (reserved only, not yet paid as I am still looking or cheaper rate online)
JW Marriott Dongdaemon - KRW200,000 per night
I plan to stay in Lotte world for two days too in Aug, I thinking it is the nearest hotel to Lotte World. Other options no need to take taxi or bus?? Thanks!