"Do you really like me?" Though they have known each other since childhood, after growing distant for some reason, Lee Yeo-reum hears an absurd rumor that Seo Ga-hyun is a 'lesbian.' Disgusted, Lee Yeo-reum is drawn in by the offer of 'If you seduce Seo Ga-hyun, I'll give you 1 million won,' and decides to pursue Seo Ga-hyun. What started as a mere bet for money, however, reveals a new side of Seo Ga-hyun that Lee Yeo-reum had never noticed before, stirring her emotions and leaving her flustered as she tries to avoid Seo Ga-hyun without a plan. Until an unexpected moment reveals the fact that she made a bet on Seo Ga-hyun. And until Seo Ga-hyun disappears without leaving a single message.