What's Up Fox?
- Title: 여우야 뭐하니 / What's Up, Fox?
- Also known as: Hey Fox, What You Want To Do?
- Genre: Romance, Comedy
- Episodes: 16
- Broadcast network: MBC
- Broadcast period: 2006-Sep-20 to 2006-Nov-09
- Air time: Wednesday & Thursday 21:55
- Original Soundtrack: What's Up Fox? OST
Single 33 year-old Go Byeong Hee works as a reporter for a sex magazine. She wants more romance and a more respectable life but isn't sure how to get it. 24-year-old Park Chul Su, mechanic and world traveler, is the younger brother of Byeong Hee's best friend. He's a free spirit and not concerned with what the world thinks. One night the two old family friends get drunk and wake up in bed together. Go Byeong Hee wants to forget it ever happened, especially since a good marriage prospect has just made an appearance. Unfortunately for her, Chul Su has other ideas....
- Ko Hyun Jung as Ko Byung Hee (reporter)
- Go Joon Hee as Ko Joon Hee (aspiring model)
- Yoon Yeo Jung as Choi Soon Nam (Byung Hee and Jun Hee's mother)
- Chun Jung Myung as Park Chul Su (auto mechanic)
- Yoo Tae Woong as young Chul Soo
- Ahn Sun Young as Park Seung Hye (Cheol Su's sister)
- Jo Yeon Woo as Bae Hee Myung (urologist)
- Kwon Hae Hyo as Hwang Yong Kil (magazine publisher)
- Son Hyun Joo as Park Byung Gak (fashion mogul)
- Choi Woo Je as Sun Woo (Byeong Hee's college friend)
- Seo Young as Joo Hee
- Seo Hye Jin as Jo Hyun Jung (Byeong Hee's co-worker)
- Jung Ki Sung as Director Kim
- Kim Hak Chul as a auto repair shop owner
- Park Byung Sun as Soon Nam's real estate employee
- Lee Hyuk Jae
- Han Young Kwang
- Kim Yoo Bin