I think those above 3 are all in Zurich. There are 3 in Geneva, 1 in Luzern, 1 in Lausanne and 1 in near Basel- Germany.

The Korean Pavillon is been quite long times and focus on locals. I think good place for experience.
Bambushain is more for Korean tourists or/and visitors. It is typical taste.
Yumi Hana is casual Korean food place and sells Korean and Japanese products togather. This place is rather cheaper and small.
You can buy some pre-cooked food items from Yumi Hana to cook @ home, too.

Enjoy! If you have any Q for recipe or/ and, I can help you.