Korean Drama “On The Verge Of Insanity” (Synopsis + Cast + Preview)

“On The Verge Of Insanity” (or “No One But A Madman”) is an MBC original drama series that released on 23 June 2021 and is available to watch online on Viki* and Kocowa*.


“On The Verge Of Insanity” kdrama tells the struggling story of middle-aged workers in the society.

Choi Ban Seok has been working as a developer at Hanmyung Electronics for 22 years. He is calm and warm in nature and also has a good sense of humour. Choi Ban Seok is now transferred to the Personnel Department, in a field he has very little knowledge about. Still he strives there to save his job.

Tang Ja Young is the head of that Personnel Department. She is a passionate worker who dreams to become her company’s first female executive. Her job position is new and the newly transferred Choi Ban Seok has to work with her. Both make an impact in each other lives.


Drama, Slice Of Life, Office


  • Jung Jae Young as Choi Ban Seok (HR team member)
  • Moon So Ri as Tang Ja Young (head of HR team)
  • Lee Sang Yeob as Han Se Kwon (development team leader)
  • Kim Ga Eun as Seo Na Ri (deputy of planning team)


Research building

  • Kim Nam Hee as Shin Han Soo
  • Ahn Nae Sang as Noh Byung Kook
  • Park Sung Geun as Gong Jung Pil
  • Park Won Sang as Paeng Soo Gon
  • Dong Hyun Bae as Ki Jung Hyun
  • Baek Min Hyun as Ahn Joon Soo
  • Kim Joong Ki as Go Jung Sik
  • Oh Yong as Pyun Dong Il

Office building

  • Cha Chung Hwa as Kim Jung Ah
  • Im Hyun Soo as So Sang Wook
  • Chun Hee Joo as Kye Bo Ram
  • Kim Jin Ho as Bae Jung Tak
  • Im Il Gyu as Oh Jae Il


  • Jo Bok Rae as Han Seung Ki
  • Kang Joo Sang as No Jae Yul
  • Kang Yun Woo as Park Hoon Jung


Korean drama “On The Verge Of Insanity” will have a total of 16 episodes.

STILL CUTS (more at Official Site)

Lee Sang Yeon and Jung Jae Young no one but a madman kdrama


  1. Jung Jae Young earlier starred in Korean drama “Investigation Couple 2” (2019).
  2. Moon Se Ri earlier starred in Korean drama “Life” (2018).
  3. Lee Sang Yeob earlier starred in Korean drama “Good Casting” (2020).
  4. Kim Ga Eun earlier starred in Korean drama “The Wind Blows” (2019).



*Drama is subject to regional availability.

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