Ruined by her family's sudden financial collapse, former heiress Eulalia is forced to work as a nightclub hostess to pay her sick mother's medical bills. One stormy night, she rescues a critically wounded man bleeding in an alleyway, taking his signet ring as collateral. The stranger turns out to be Cosimo Moretti, the most feared mafia don in the city, who soon forces her into a substitute marriage to satisfy his syndicate elders. Living under armed surveillance, Eulalia uncovers that Cosimo's deadly rival Damon has imprisoned her missing mother in an asylum to harvest a rare antibody. Together, Eulalia and Cosimo dismantle Damon's syndicate, but Cosimo reveals an agonizing secret: he is actually Caspian, an imposter sacrificing his remaining months of life to protect the Moretti bloodline. Despite the deception, Eulalia's heart belongs entirely to him. When dangerous enemies return to eliminate their young son, can Caspian survive to protect his family?
DramaTap