Jae-hyeon is about to return to university after military service and making moneny by selling sweet potatoes. One day a regular customer and call girl Hye-ri asks him to be friends and Jae-hyeon, who was interested in her, says yes. One evening he sees her getting beaten up by her pimp husband and Jae-hyeon rushes to help her. They get close from this point on and spends a night together. However, she's hurt the next day when she sees the money he's left for her and never sees him again.