Wherein Seulgi and Jongin fail to communicate properly after what she refers to a love confession and what he calls a 'mistake'. They do not understand each other and instead of a reconciliation, they decide to play a game where no one wins. Carnation is the story of two lost bestfriends longing for each other with a heavy past and bright futures as idols. Now the real question is will they ever be able to overcome the obstacles and become more than two parallel lines going their way to reach the stars?