Sarah, a top-tier divorce attorney, stumbles upon her fiancé Xavier having an affair with Avery, the wife of Rhett, CEO of Sterling Group, in an underground parking garage on their third engagement anniversary. Overwhelmed with heartbreak, she is stopped by Rhett, who has also been betrayed by his spouse. Rhett hires Sarah to handle his divorce lawsuit and takes her to a hotel to catch the two lovers in the act, where Sarah witnesses Xavier and Avery’s intimate encounter firsthand.Seeking revenge on Xavier, Sarah spends one passionate night with Rhett. The next day, she discovers that Xavier himself recommended her as Rhett’s divorce lawyer, making her realize the entire ordeal was Rhett’s carefully laid scheme. While working on the divorce case, Rhett persistently pursues and tests her. He then pulls out a shell necklace Sarah gave him in their childhood, revealing their childhood pact: if they were both single when they grew up, they would marry each other.