Shi Won was a coffee lover , She works as a barista in a café called ' The Lovers Of Coffee ' . One day , she met a guy , a cold guy named Myungsoo. He only likes espressos , and he definitely doesn't like her . After firing her from her job, they met again, under different circumstances. Will she change his heart with her love for mocha frappuccino ? Or will their relationship be as bitter as espresso ? Will they fall in a bittersweet love like a caramel macchiato ?