One day, Hana wakes up to find herself in the world of a romance novel—as the first fiancée of the male lead. The problem? Her character is a minor one destined to be poisoned at the engagement party of Cheon Nam-joo, heir to the Cheonnam Group. To avoid her tragic fate, Hana proposes a contract marriage to Park Woo-jin, the notorious "tyrant" and acting chairman of the rival Samjeong Group. Woo-jin accepts the offer, and Hana’s destiny begins to veer in an unpredictable direction.