In My Cold-Hearted Mafia King movie, after her father's death, Vivian was abandoned by her stepmother Catherine and stepsister Olivia, then kidnapped and trafficked—until she was rescued by Damien Russo, the king of the mafia, and brought into his home. Despite their age gap, Vivian gradually develops feelings for Damien, while he struggles to resist the temptation. When an arranged marriage between Olivia and Damien is revealed, chaos ensues, putting their already complicated and budding romance to the ultimate test.