Children...
아이들... (original)
The film is based on a true yet unsolved murder case from the early 1990s that is known among Koreans as the "disappearance of the frog children." In 1991, five elementary school students told their parents that they were going to hang out on a nearby mountain to catch frogs, and then they go missing.
Starring Park Yong-woo, Ryu Seung-ryong, Sung Ji-ru, Kim Yeo-jin, Sung Dong-il, Park Byung-eun, Kim Koo-taek, Park Mi-hyeon, Kim Gu-taek, Lee Sang-hee
It's a crime and drama movie, and has a rating of 7.2 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from United States.