Paik Sa Eon, a 36-year-old billionaire heir, is trapped in a loveless arranged marriage with In-A, a woman whose unrequited love he coldly dismisses. His life revolves solely around his empire until Hong Hee Ju, a 24-year-old sign language interpreter, enters his world. Her innocence and talent captivate him, sparking a dangerous obsession. As Sa Eon pursues Hee Ju, crossing moral and professional boundaries, she battles guilt over their illicit affair, while In-A unravels upon discovering her husband's betrayal. The story spirals into a dark tale of manipulation, heartbreak, and revenge, culminating in tragic consequences for all three Themes: Obsession, betrayal, power dynamics, moral decay. Starring: Paik Sa Eon (Yoo Yeon Seok), Hong Hee Ju( Chae Soo bin) and Paik In-A Characters and Plot inspired from the book "When the phone rings" Warning ! 18+ Mature Content ahead.