In a world where an app lets you know whether or not someone is in love with you within a 10-meter radius, feelings are transparent even when you don’t want them to be. The story centers around a hardworking and studious student Kim Jo-jo who catches the eye of two guys (who just so happen to be best friends and basically are like brothers) in her school: Hwang Sun-oh and Lee Hye-yeong. Sun-oh is a model from a rich family and could not be any more different from Jo-jo but they fall for each other. As time passes, the two drift apart and Hye-yeong sees this as a chance to finally confess his feelings for Jo-jo. At the end of season one we’re left with a cliffhanger: who will Jo-jo choose to be with?