The eldest daughter of the Carson family, Claire Carson, runs away. To save their family, the Carson parents force their younger daughter, Joy Carson, similar to her sister, to be the substitute bride. Joy takes her sister's place and marries the CEO of the Lawson Group, Silas Lawson. She sees Silas as her brother-in-law, wanting her sister's return. This mistaken marriage holds a hidden obsession and a past buried between the two for many years.