Joon-Kyung (Uhm Hyun-Kyung) and Ki-Jung (Kim Young-Hoon) have dated for 3 years. One day, Joon-Kyung breaks up with Ki-Jung because he was late on a date. Later that day, Joon-Kyung hears that a city bus, which Ki-Jung was possibly riding, got into a terrible accident. Joon-Kyung keeps calling Ki-Jung, but he doesn't answer. She keeps waiting for his reply. One day, she receives a text message from Ki-Jung.