Youngbi is a great dancer whose dream is to become an idol singer. Haeyul is a girl who dreams to be a world-famous youtuber. Bora is one of the top students in class who has recently fallen in love for the first time. They are all in the same dance club in high school. One day, they watch a video on an application called Ding-Dong Challenge. It says that if they dance the same... (展開全部)