Here's info re: The Club (their name for exec lounge pre Marriott days) & other information via a document provided at check-in. The FTer sent me an image, but I couldn't get it to display properly so will rekey the info (you're all welcome).

CLUB LOUNGE

Club Lounge Hours: 6:30am-10:00pm, 18F

Continental Breakfast: 6:30am-10:00am
Afternoon Tea 11:30am-5:00pm
Happy Hour 5:00pm-9:30pm (hors d'oeurves 6:00-8:00pm)
Evening Snack 9:00pm-10:00pm

Breakfast is only available in the lounge. For breakfast at the buffet restaurant, The Seven Square, the additional fee (W30,250/person, including VAT & service charge) will be charged.

Personalized check-in and check-out service

Lounge Conference Room (8 persons): 2hours/day, max 4hrs/day for group staying guests (subject to availability)

Complimentary club access is for guests staying at club room. For additional guests, will be charged as following:

Continental Breakfast W38,000/person (including VAT & service charge)
Afternoon Tea W17,000/person (including VAT & service charge)
Happy Hour W40,000/person (including VAT & service charge)

Children under 13 are not allowed to access

ADDITIONAL PRIVILEGES

Complimentary laptop rental

The Plaza Fitness Club - access to sauna, swimming pool, gym. Weekdays 6:00am-10:00pm, Sundays/Holidays, 7:00am-9:00am, located in the Annex, 16F, Closed on 3rd Friday of month

Complimentary regular laundry service: 1 shirt/blouse through day (non-accumulative during stay)

Complimentary wired/wireless in room. Access to 'plaza_guest' with room number and last name.

Room amenity: Hermes, Nespresso coffee machine

SPECIAL OFFERS FOR MARRIOTT GOLD/PLATINUM ELITE MEMBERS

Hotel F&B 20% Restaurant discount, Laundry 20% discount, The Belle Spa 20% discount

Complimentary access to 1 additional guest accompanying with a member (Sharon's note: think this refers to exec lounge access)