A woman enters the imposing house of Park Woo-jin, known as a tyrant because no one leaves his residence unharmed or fully intact. She proposes a contract marriage to him, leveraging her knowledge of a hidden 4-billion-won necklace that once belonged to her father and is crucial for Woo-jin to secure his position as Samjung Group's official president. Woo-jin reacts with disbelief and amusement but listens as she insists on a deal. Despite warnings from guards to leave, she remains determined, realizing she's now entangled with a dangerous man whose secrets put her safety at risk.