answer for your question
hi! nice to meet you.
I have read article about your journey in Seoul last year 2010.
You dooubted why your husband,s T-MONEY got reduced faster than yours.
It is becuse your T-money was for "Young student and child" and your husband' T-money was for normal adult.
I am Korean and lived In Seoul,visited Japan many times. I hope you had wonderful time during your stay in Seoul.
Thank you.
P.S. I can speak,wrtie Japanese,but My computer is not sutable for typing Japanese. You can answer me in Japanese .