Jennie is smitten by her roommate Lisa. Lisa is the apple of the eye of Jennie's bff, Jisoo. Jisoo is the love of Rosé's life only their bff Jennie knows. And Lisa...likes Jisoo. Teamed up to kill the budding romance but failed, Jennie and Rosé "accidentally" ended up being 30-day girlfriends. But when one catches feelings for the other, will 30 days be enough to win the other's heart? Or will both be left to die at the shadows of unrequited love.