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Gyeong-ahworksasacaregiverandlivesalone.Theonlyoneshecanrelyonisherdaughter,Yeon-su,butit’shardtoseeheraftershemovedoutonherown.Meanwhile,Yeon-su,whoissufferingfromherex-boyfriend,Sang-hyun,argueswithhimagainandvisitshermother’shouse.AfterYeon-suleft,Gyeong-ahreceivesashockingmessagefromastranger.