1. Hotel "Hoam Faculty House" : http://www.hoam.ac.kr/eng
2. Transportation from ICN and GMP airports in Seoul is explained here:
http://www.hoam.ac.kr/eng/hoamHotel/contact_us.php
3. SNU campus map : download
The left red circle indicates the hotel. The right red circle indicates the department of mathematics (Building No. 27 and No.129). The workshop takes place on 4th floor of No.129 Building.