Delivery man Dong-soo has a tic disorder that causes him to say inappropriate words he doesn't mean. Online novelist Ye-ri has closed herself in her apartment ever since her sibling's death. Twice a week, Dong-soo makes deliveries to Ye-ri and they develop a quiet bond, talking about things they've never told anyone else. Ye-ri reveals that it was her late sibling's wish to see a sea without water, and Dong-soo decides to fulfill that wish for her.
En el estricto instituto de Younghwa, las jóvenes estudiantes se preparan durante su último año de curso para el Día-D, el día del examen de entrada a la universidad. Además del estrés que todo ello conlleva, 4 amigas empezarán a sufrir extraños sucesos relacionados con el obscuro pasado que guarda el instituto.
