Mi-jo (played by Son Ye-jin) is the thirty-nine year old director of a dermatology clinic. This is in Korean age mind you. Going by international age, they're all either thirty-seven or thirty-eight, depending on when their birthday is. Anyway Mi-jo is going on sabbatical soon, but mostly just hangs out with her best friends Chan-yeong (played by Jeon Mi-do) and Joo-hee (played by Kim Ji-hyun-II) who are also thirty-nine, Bad and Crazy, Thirty Nine, Jeon Mi-do, Kang Mal-geum, Kim Ji-hyun-II, Kim Sang-ho-III, Lee Dong-wook, Lee Moo-saeng, Lee Tae-hwan, Son Ye-jin, Yeon Woo-jin, Yoo Yeong-ah