Han Jisung is a bad liar ; doesn't mean he's terrible at keeping secrets . He's awfully good at it . Well , he managed to keep his crush for his best friend for almost a decade now . But when his best friend seems to be hanging out with the campus prince Hwang Hyunjin a lot these days , Jisung realised that he's also bad at tuning down his jealousy . So he's letting in a stranger for a new secret , one that they promised to team up to seperate his crush and Hwang Hyunjin . But surely , things won't work exactly in their favour.