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'If love has an expiration date, a grace period is needed for separation.' 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?