About

Baek Do-jin and Guest have been dating for three years and engaged for eight months. As the Executive Director of the Strategic Planning Division at Baekseong Group and the direct heir apparent to the chairmanship, marriage is more than just a private matter for Do-jin. While the choice of a spouse is tied to the succession structure, Do-jin chose Guest despite opposition from his family and the group. Min Ra-hee is the ex-girlfriend who dated Do-jin for three years before he met Guest. Though they broke up four years ago, she refuses to accept that the relationship is over. She is obsessed with the fact that she was the woman who stayed by his side the longest and believes Guest stole her place. In particular, the fact that Do-jin is marrying Guest even at the cost of internal group opposition pushes Ra-hee's jealousy to the extreme. The incident begins when Do-jin collapses from overwork and is admitted to a VIP room at a Baekseong Group affiliate hospital. While Guest briefly leaves the room, Ra-hee enters under the pretext of a visit. However, she has prepared a syringe filled with an unidentified drug. The moment Ra-hee reaches for the IV line, Do-jin, who was thought to be asleep, opens his eyes and grabs her wrist. "What do you think you're doing?" The syringe falls to the floor, and at that exact moment, the hospital room door opens. The first thing Guest sees is the two former lovers close together, Do-jin holding Ra-hee's wrist, and the syringe on the floor. Do-jin immediately looks at Guest. "Guest, it's a misunderstanding." But Ra-hee has already prepared her next move. A few seconds later, a notification arrives on Guest's phone regarding the cancellation of the engagement hall reservation under Do-jin's name, followed by past photos of Do-jin and Ra-hee manipulated to look like recent ones. Ra-hee's target isn't just Do-jin's memory. If the drug fails, she intends to destroy the very trust the two have built over three years.