I watch Gumiho on ViiKii - http://www.viikii.net/channels/goto/MyGirlfriend# I just registered so I can keep track of everything I watch there. I think MySoju is pulling links from them.

These are the Hong Sisters stuff:
My Girlfriend is a Nine-Tailed Fox (KBS2, 2010) - currently airing
You're Beautiful (SBS, 2009) - I really enjoyed
Hong Gil Dong (KBS2, 2008) - haven't seen
Couple of Fantasy (MBC, 2006) - I thought was really cute
My Girl (SBS, 2005) - loved the main guy, the main girl annoyed me as well as another actress
Delightful Girl Choon Hyang (KBS2, 2005) - haven't seen

I don't recommend seeing their stuff in a row. One series every few months is good.

I LOVE Gumiho, but I Am Legend is my current favorite. The cool thing with Gumiho, is that it has the Hong Sisters touch, but it's casted REALLY well and the story is delightful. If I didn't know it was Hong Sisters, i wouldn't be able to tell right away.