Love Alarm is an app that tells you if someone within a 10-meter radius has a crush on you. It quickly becomes a social phenomenon. While everyone talks about it and uses it to test their love and popularity, Jojo is one of the few people who have yet to download the app. However, she soon faces a love triangle situation between Sun-oh whom she starts to have feelings for, and Hye-young, who has had a huge crush on her.
as Kim Jojo
as Lee Hye-yeong
as Hwang Sun-oh
as Park Gul-mi
as Chon Duk-gu
as Ji-Hoon
as Yuk-jo
as Brian Chon
as Mon-sun
as Jeong Mi-mi
as Bae Gyeong-hee
as Hwang Jae-cheol
as Jojo's Aunt
as Kim Min-jae
