"How could you hide my child from me..." "It was for the best..." Two heirs from a rich family were in an arranged marriage. They promised to ignore each other's existence and pretend they don't know each other. A story where Jeon Jinha gets engaged to Jake as a replacement for her older sister who died because of an accident. What if Jinha gets pregnant with his child because of an accident? Will she tell him? Or will she keep it a secret to fulfill their promise?