No Turning Back Seohyun and Sooyoung are two sisters who very different from one another as Seohyun she's plays by the book while Sooyoung the younger sister is more playfully, their parents die when Seohyun was only 18 years old and she has been taken care of Sooyoung since then. When Seohyun got an offer from the Ceo wife Mrs. Kim to make a 10 years contract agreements with Seohyun to be married to her youngest son Kr