On Air () is a 2008 South Korean television series, starring Kim Ha-neul, Park Yong-ha, Lee Beom-soo and Song Yoon-ah. The series is a behind-the-scenes look at a fictional television drama, revealing details about what normally goes on behind a TV drama production. It aired on SBS TV from March 5 to May 15, 2008 on Wednesdays and Thursdays at 21:55 for 21 episodes.
Jang Ki-joon (Lee Beom-soo) used to be a top manager in the business but he went bankrupt as he couldn't compete with other powerful agencies. He was 'rescued' by Oh Seung-ah (Kim Ha-neul), a top star who agreed to join his agency after breaking off with her former one. Lee Kyung-min (Park Yong-ha) is a drama PD who gets his first chance at being a director. Seo Young-eun (Song Yoon-ah) is a much sought-after scriptwriter who is divorced and has a young son. On Air revolves around these four entertainment industry figures - a director, a writer, an actress, and her manager - as their personal and professional lives intertwine during the shooting of a drama. It also portrays how the whole production team and performers complete a project in a tight schedule as well as how actors, actresses, and entertainment agencies handle rumors surrounding them.
The series features 27 cameo appearances, among them are Jeon Do-yeon, Kim Jung-eun, Lee Seo-jin, Kim Min-jun and Yoon Se-ah, who had previously worked with writer Kim Eun-sook and director Shin Woo-chul on Lovers in Paris, Lovers in Prague, and Lovers. Song Yoon-ah also asked her celebrity friends to appear on the show, namely Lee Hyori, Kang Hye-jung, Uhm Ji-won, and comedian Kim Je-dong.
Parts of the series were filmed on location in Taiwan, where the character Lee Kyung-min goes in search of Seo Young-eun, who went to Taiwan on vacation.
The series aired on Mnet Japan beginning July 30, 2008. Park Yong-ha and Song Yoon-ah visited Japan to promote it in a showcase attend by 800 VIP guests at Toho Cinema in Roppongi Hills, Tokyo.