High School King of Savvy

Lee Min-suk (Seo In-guk) is a high school student and varsity ice hockey player. He and his older brother, Hyung-suk, look very much alike despite their nine-year age gap. When he gets a mysterious phone call from Hyung-suk telling him to impersonate him at the latter's new job, Min-suk is forced to pretend to be a high-ranking executive at an IT conglomerate. Living a double life while unaware of the rules within the Korean workplace, Min-suk learns how to navigate his way in the world of adults with the help of Jung Soo-young (Lee Ha-na), a temp with an odd personality whom he eventually falls in love with.

• Seo In-guk as Lee Min-suk / Lee Hyung-suk^{[3][4][5][6][7]}
  • Seo Dong-hyun as young Lee Min-suk

Lee Min-suk is an 18-year-old high school student who impersonates his 28-year-old brother, Lee Hyung-suk, at the latter's new job as director of Retail Team at Comfo Company.

• Lee Ha-na as Jung Soo-young^[8][9][10]

A 28-year-old contract employee of Retail Team at Comfo Company, and later Lee Min-suk/Lee Hyung-suk's secretary.

• Lee Soo-hyuk as Yoo Jin-woo^[11][12]

The 30-year-old director of Project Team at Comfo Company, and illegitimate son of the company's chairman.

• Lee Yul-eum as Jung Yoo-ah

Jung Soo-young's sister, an 18-year-old high school student.

• Oh Kwang-rok as Choi Jang-ho, Lee Min-suk's and Lee Hyung-suk adoptive father
• Kwon Sung-duk as Choi Man-suk, Lee Min-suk's and Lee Hyung-suk adoptive grandfather

• Kang Ki-young as Jo Duk-hwan, Lee Min-suk's friend and classmate
• Lee Tae-hwan as Oh Tae-suk, Lee Min-suk's friend and classmate
• Kim Seung-hoon as Kim Dae-chul, Lee Min-suk's ice hockey coach
• Ji Yoon-ho as Park Ki-hoon, Lee Min-suk's senior in ice hockey team

• Han Jin-hee as Yoo Jae-guk, chairman of Comfo Company
• Song Young-kyu as Nam Sang-goo, director of Comfo Company
• Jo Han-chul as Kim Chang-soo, team leader of Retail Team
• Kim Won-hae as Han Young-suk, director of Comfo Company
• Park Soo-young as Yoon Dong-jae, assistant manager of Retail Team
• Choi Phillip as Park Heung-bae, employee of Retail Team
• Lee Joo-seung as Ji Dae-han, employee of Retail Team
• Lee Ah-rin as Han Sang-hee, employee of Retail Team
• Shin Hye-sun as Go Yoon-joo, employee of Retail Team
• Chun Yi-seul as Yoon Do-ji, employee of Retail Team

• Yoon Yoo-sun as Yoo Jin-woo's mother
• Jang Se-hyun as Yoo Jin-woo's friend
• Min Ji-ah as Jung Soo-young's hometown friend
• Shim Hyung-tak as a busy boyfriend
• Lee Chung-ah as attractive girl
• Park Hee-von as contract girl
• Hana as Park Jin-joo
• Yein as Lee Bit-na

The first script reading was held on April 25, 2014, at the CJ E&M Centre in Sangam-dong, Seoul, South Korea.^[13] Filming commenced in early May 2014.^[14]

Seo trained with the Kwangwoon University hockey team for two months in preparation for his role as an ice hockey player.^[15]

On July 22, 2014, it was announced that the series would be extended by one episode, and a special broadcast would be aired following the end of the 17 episodes.^[16]

• In this table, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings.
• N/A denotes that the rating is not known.

• This drama airs on a cable channel/pay TV which normally has a relatively smaller audience compared to free-to-air TV/public broadcasters (KBS, SBS, MBC and EBS).