When Jessica loses everything, she meets Tiffany and Seohyun who are a member of a Gang Thief. One night they broke into a bank and were wanted by NY Police Department. They have no choice but to hide and fly back to Seoul where they meet Yuri, Yoona, and Taeyeon who are known, businessmen.  

Yoona and Seohyun are spy agents of NIS, who always get their jobs done. But being agents means, they have to go out of the country all the time. When they finally have six months of break from work, they grab the chance to be with their son, only to realize he doesn't know them. And they too doesn't know him well besides his name.