After being killed by the obsessive male lead Killian, Ines finds herself back in the real world as Sum. Determined to live differently this time, Sum resolves to finally claim a happy ending. But to her shock, she meets Lee Haewon, a school celebrity who looks exactly like Killian. As Sum grows confused by Haewon's kindness—so unlike the arrogant and violent Killian she once knew—Haewon hides his true intentions, carefully shaping himself into someone Sum would love. What awaits them in the future?