Kimchi may be an acquired taste, and best enjoyed in moderation, but when in Seoul...
I can't recommend any one place over another, because I don't recollect the name of one place we went and never caught the name of the other, but I would encourage you to go for Korean Barbecue with all the little dishes of accompaniments and the grill right in the table where you can either cook it yourself or watch closely while the waitstaff cooks the meat. You'll leaving feeling like a real carnivore.