I remember back then when I was an ELF, I sometimes watched that movie. (I watched the full movie on youtube)
It was a movie that featured all the members of Super Junior (except for Kyuhyun who was still recovering from the car accident that happened in 2007).
The movie also featured SNSD's Yuri, Super Junior-M's Henry, SHINee's and EXO Suho.
I have often found the movie's synopsis weird.
As IMDb says:
"After the unusual attack (tossing of a bag of feces) on a school 'flower boy' (heartthrob or pretty boy), Sungmin, on February 14, the same attacks begin to happen at different high schools on every month of the same day. Rumors say that the next victims will be at Neulparan High School. The studious student Kibum decides to investigate the matter, blogging all of the terror events on the 14th of each month, causing the event to become a hot topic within the student body. After several attacks, Kibum predicts that the next victim will be either Siwon, president of the student body; Heechul, president of the dance club; or Kangin, the captain of the Judo Team."
I mostly find the plot weird because of it's toilet humour.
But I guess there was also a message in that movie that was like "people will do anything to get popular."
I kinda wish though that kpop groups had silly movies and stuff like this again.
And well... I feel like nowadays, if someone decided to make a movie featuring a kpop group, they probably would make a serious one based on the kpop group's lore.