Character Arc
Hong Hee-joo is the female lead of When the Phone Rings, a sign-language interpreter who works in court and on television and is the daughter of a newspaper proprietor. Reserved and observant, she carries the weight of a childhood marked by trauma and communicates with a quiet strength. She agrees to a contract marriage with Baek Sa-eon, an arrangement that links their two prominent families, and settles into a household where she and her husband behave more like cautious acquaintances than partners.
Her carefully ordered life is thrown into turmoil when a hostage crisis places her directly in danger. The ordeal strips away the polite distance of her marriage and forces both Hee-joo and Sa-eon to confront what they mean to each other. As a long-buried secret tied to their shared past comes to light, Hee-joo re-examines the choices that brought her into this marriage and discovers that the bond between them is older and more personal than the contract suggested.
Over the course of the series Hee-joo grows from a guarded, dutiful wife into a woman who claims agency over her own story, navigating threat, mystery, and a slowly rekindling romance. Her resilience and emotional clarity ground the drama, and her relationship with Sa-eon shifts from formal arrangement toward mutual trust and protection. Scenes of danger surrounding her are handled with restraint, keeping the focus on suspense and her interior strength.