L'Héritier Inattendu

A security guard accidentally saves the life of a wealthy family's illegitimate son from an assassination attempt. Desperate for money for his sister's surgery, he decides to risk everything and impersonate the young heir, returning to the Sterling family. Soon after returning, he attends a party with his fiancée and runs into his college sweetheart, who mocks him. Can the security guard navigate the treacherous world of the wealthy and become the true heir?