A promotional poster for Seoul's tap water promoting event / Courtesy of Seoul Metropolitan Government

Seoul city is launching a two-episode hidden-camera YouTube series featuring Korean comedians to promote Arisu, the city's tap water, during public World Cup viewing events.

The series, titled "Muldeun Akma Eungwondan" — loosely translated as the "Water-Bearing Cheering Squad," a play on the Red Devils, Korea's official football supporters' group — stars comedians Shin Gyu-jin and Kim Yong-myung.

The concept is inspired by the hydration break, a stoppage introduced at this year's World Cup around the 22nd minute of each half to allow players to rehydrate in hot conditions. The city says the same principle applies to fans at outdoor viewing events.

The first episode was filmed June 12 during Korea's group-stage match against the Czech Republic, in which the national team rallied for a 2-1 comeback win.