All,
a replied from Doojin Hwang:
"...As for the buildings to visit, may I suggest to your students to visit our website (www.djharch.com) and to tell me what they are interested in seeing? My major architectural works are divided in 3 groups: contemporary buildings in historic center of Seoul / renovation and rebuilding of traditional houses, also in historic area / public projects related to the Han River Renaissance.
Normally, I show to people either innovative traditional renovation projects in Bukchon area or a Korean medical clinic, also nearby. Currently 3 buildings are under construction in my own neighhood and they will be all completed by then.
I'll be happy to take the group to the area of interest myself.
By the way, I must tell you that I have fond memories of Thailand, especially the city of Ayutaya."
So, visit his website and reply in comment to let me know about your interest by Sunday evening. He is well known for his approach in combining (or preserving) traditional with modern/contemporary design. I'm sure you will learn a lot from a meeting and discussion with him.
Visit his youtube channel as well, Krist you might be interested in the iPhone application that he is using.