It's called "Flower Grandpa Investigation Unit" and it's a very popular television series in Korea, where it's recording record ratings. The story is rather strange: three detectives between the ages of twenty and thirty find themselves transformed, due to a clinical experiment gone wrong, into elderly people in their seventies and decide to leave, together with a fourth detective who has managed to stay young, to search for the way to recover their true age. The hunt for lost youth, interspersed with various police cases all promptly solved, will take them around the world, in a crescendo of tragicomic events, from Taiwan to Spain, passing through Turkey. In addition to the producers of the series and the television sponsors, this great success benefits the Korean airlines, which have seen a surprising increase in the number of passengers on their direct flights to the locations that form the backdrop to the adventures of the improbable quartet. The episode of the series set in Madrid, for example, brought Korean airlines such an amount of bookings that it forced the airline to replace the aircraft usually used for the route, an A330-200, with a B747-400, which it can carry about 150 more passengers. The second largest airline in the country, Asiana airlines has seen, again thanks to the "granpas" of the sitcom, its planes fill up, reaching a rate of 91% for flights to Taipei, and 87% for flights to Istanbul .
http://english.chosun.com/site/data/html_dir/2014/05/21/2014052101626.html
