Park Y/n, 23-year-old colleague studying in Arts and Entertainment Management somewhere in Seoul. Living alone at an apartment while her parents working overseas. Visit her on their holiday only. Despite being able to study in a nice place, a best friend(or crush), living a luxurious life, she still feels lonely. Until one day, she's going out for grocery and when she about to enter the store, her life changes completely. A roommate? Parenting responsibility? Lover? Enemy? Read this story to find out what's happens.