Here is some action happening on the Seoul Eats Facebook Page.  You can easily join the group by going here. 

Renate was looking for English High Tea service for a friend.

Renate  Hi everyone^^ Does anyone know a teahouse in Seoul where you can have English High Tea (it's also being called Afternoon Tea - it's tea served with cookies, cakes, sandwhiches and more sweets^^)? Me and some people from Couchsurfing are planning to do this on either 10th or 17th, but we are still looking for a good pla...ce~ If anyone wants to join us, please PM me! I'll post again here once the exact date and place have been decided :) Wishing you all a Happy New Year!!^^ Renate 정란^^

Here is a response from Hyungseung:

Hyunseung Lee The 'Cornerstone' has a weekend Dessert that serves sandwich, bread and some dessrt with fresh juice, coffee and tea. It is a kind of dessert buffet.
Time. It's only on weekends from 3pm~5pm. It costes fee 25000won per person(excluding vat 10%). You can find it at the Park Hyatt Seoul at the Cornerstone.