Yeon-kyeong and Yeong-wook have been married for 10 years and are still together out of loyalty. However, 'they' come into their unsteady lives! Min-sik is a man who has his own ways, Jae-soon likes to enjoy life, and Hye-in doesn't keep anything bottled up. Yeon-kyeong and Yeong-wook's meaningless married life suddenly sees a thrilling turn of events...