The following is the information of hotels near the COEX. 

Name Hotel Peyto Samseong② Hotel Uri&③ GLAD Gangnam COEX center④ Shilla Stay Samsung
Price per night 100,000 KW
(Breakfast 15,000 KW per person)
80,000 KW
(No breakfast)
80,000 KW
(No breakfast)
99,000 KW
(Breakfast 28,000 KW per person)
Minutes to COEX5 min.5 min.10 min.5 min.
Total rooms163175282309
Phone(+82) 2-6936-8100(+82) 2-500-2300(+82) 2-6474-5000(+82) 2-2175-9000