简介：　　Gyeong-ah works as a caregiver and lives alone. The only one she can rely on is her daughter Yeon-su but it's hard to see her after she moved out on her own. Meanwhile Yeon-su who is suffering from her ex-boyfriend Sang-hyun argues with him again and visits her mother’s house. After Yeon-su left Gyeong-ah receives a shocking message from a stranger.