What does the Korean movie Train tell?

Train tells the story of a rainy day. (), who runs a pet hospital, took Jiang (), who will enter the wedding hall in a month, back to his hometown to visit his parents. On the way, Wen Hao got off to go shopping, and Sun Ying mysteriously disappeared from her boyfriend after receiving a phone call. Anxious Wen Hao looked around and found the fact that he couldn't believe it.