Big (Hangul: 빅) is a 2012 South Korean romantic comedy television series starring Gong Yoo, Lee Min-jung and miss A‘s Suzy. It is about angst-ridden 18-year-old Kang Kyung-joon, who finds himself trapped in the body of 30-year-old pediatrician Seo Yoon-jae.

It was aired on Korean Broadcasting System (KBS) from June 4 to July 24, 2012 on Mondays and Tuesdays at 21:55 for 16 episodes.

The series is written by Hong Jung-eun and Hong Mi-ran and directed by Ji Byung-hyun and Kim Sung-yoon. This marks Gong Yoo‘s first television series since The 1st Shop of Coffee Prince in 2007 and being discharged from mandatory military service.


Gil Da-ran (Lee Min-jung) is a struggling substitute teacher trying to get her certificate, and engaged to a kind and handsome doctor, Seo Yoon-jae (Gong Yoo). It’s a fairy-tale-come-true until one month before the wedding, Yoon-jae inexplicably becomes more distant. At the same time, Da-ran meets a 18 years old transfer student from the United States, Kang Kyung-joon (Shin Won-ho), who’s got an attitude towards everyone except Da-ran. But then Kyung-joon gets into a fateful car accident, with Yoon-jae, and the two of them drive over the guard rail and into the deep waters. Yoon-jae tries to save Kyung-joon, but in the process, Yoon-jae dies and Kyung-joon ends up in a coma. Kyung-joon soon wakes up… but finds himself in Yoon-jae’s body.


Main cast

Supporting cast

  • Kim Seo-ra as Ahn Hye-jung, Yoon-jae’s mother
  • Ahn Suk-hwan as Gil Min-kyu, Da-ran’s father
  • Yoon Hae-young as Lee Jung-hye, Da-ran’s mother
  • Jo Young-jin as Seo In-wook, Yoon-jae’s father
  • Choi Ran as Kim Young-ok, vice principal
  • Moon Ji-yoon as Na Hyo-sang, PE teacher
  • Shin Ji-soo as Lee Ae-kyung, Da-ran’s friend
  • Jang Hyun-sung as Kang Hyuk-soo, Kyung-joon’s uncle
  • Go Soo-hee as Lee Kyung-mi, Kyung-joon’s aunt-in-law
  • Im Ji-eun as Kang Hee-soo, Kyung-joon’s mother
  • Lee Hee-jin as the bride (cameo, episode 1)