Lena, who possesses extraordinary innate strength, saved Ryan, a framed heir to a financial conglomerate, five years ago. She left after unexpectedly giving birth to a pair of boy-and-girl twins. Five years later, to fend off forced marriage and the inheritance crisis from their families, the two enter into a contract marriage. Ryan has no idea that Lena is the savior he has been searching for for five years, nor that the twins are his biological children. They join forces to fight William, Ryan’s scheming uncle who covets the family fortune. With superior intelligence and unusual strength, the twins repeatedly help them out of dangers. After many twists and turns, the whole family is finally reunited.