Na-rin could not easily accept the breakup with her long-time lover Eun-chan after being informed of the sudden breakup, so she wants to have a one-month grace period for Eun-chan's feelings to return. "Love always ends out of the blue, and parting is always difficult." But as Na-rin jumps into the album production project for "History of Love," she's in a position to think about "breakup" more than anyone else. Can Na-rin find the purpose of the breakup that she has postponed?

Su-an, a performing arts high school student, becomes close with Seol, an actress and celebrity. During a trip, they realize that they have feelings for each other. However, misunderstandings pile up too much, and Seol leaves Su-an. Su-an later becomes an actress and returns to the winter sea, longing for Seol.