A man falls in love with a woman sitting across from him on a train to Pusan. A husband and wife who are deeply in love must deal with loss. A veteran actress coaches a young new actress on the art of seduction. A new widow discovers her deceased husband’s infidelity and decides to take in his mistress. Three young couples in high school decide to test their commitment by swapping partners for 24 hours. All of these stories about love intersect in unexpected ways.