"Someone within a 10 m radius likes you." With these words, LoveAlarm, an app that alerts users to the feelings of others, turned the world upside down. For struggling but optimistic high-schooler Kim Jojo, the day it-boy Hwang Sunoh rang her LoveAlarm felt like the start of a beautiful romance. But when the app that was meant to bring people together begins to dig up the darkest of emotions, Jojo quickly realizes that people may have been better off before they lived in a "ringing world"...