Infinite Challenge has been reported as the first "Real-Variety" show in Korean television history. The program is largely unscripted, and follows a similar format of challenge-based Reality Television programs, familiar to the audiences in the West, but the challenges are often silly, absurd, or impossible to achieve, so the program takes on the aspect of a satirical comedy variety show, rather than a more standard reality or contest program. In order to achieve its comedic purposes its 6 hosts and staff continuously proclaim, the elements of this show are the 3-Ds, Dirty, Dangerous, and Difficult.

With no clue how he came to be imprisoned, drugged and tortured for 15 years, a desperate man seeks revenge on his captors.

Kim Sun-woo is an enforcer and manager for a hotel owned by a cold, calculative crime boss, Kang who assigns Sun-woo to a simple errand while he is away on a business trip; to shadow his young mistress, Hee-soo, for fear that she may be cheating on him with a younger man with the mandate that he must kill them both if he discovers their affair.

A notorious dirty cop makes an honest attempt to catch a serial killer who even murdered his own parents.

Overweight detective Cha Chul-soo transforms himself into a model and has to lose his weight in two weeks to solve a criminal case.

A former safecracker makes a living as a taxi driver but continues to be haunted by her past. One day she chances upon an aspiring singer, who is a spitting image of herself back in the day. Together, the two women plot to steal money from gangsters.

A woman stands trial for her life with a lawyer who is determined to save her despite her refusal to be saved.

It seems to be a harmonious and happy family gathering. Conversations that begin with lighthearted jokes gradually uncover long-standing conflicts. Despite everyone's efforts to resolve and improve their relationships, the discussions only grow increasingly complicated.