Just days before her fairy-tale wedding, Shin Ji-Hyun is living the perfect life: cherished by her parents, adored by her friends, and engaged to the man of her dreams. But a devastating car accident shatters everything, leaving her in a coma. Trapped between life and death, Ji-Hyun meets the Scheduler, a mysterious figure who offers her a chance to live again if she can find three people outside her family who will shed genuine tears for her within 49 days. To do this, she borrows the body of Song Yi-Kyung, a night-shift worker drowning in sorrow and on the brink of ending her own life. Living in Yi-Kyung’s body, Ji-Hyun believes her fiancé and best friends will surely be among the three. But as hidden memories begin to surface, she recalls seeing her fiancé and closest friend together just before the crash—too close. Doubt creeps in, and her once-certain heart begins to crack. With time slipping away and betrayal rising to the surface, Ji-Hyun must face the painful truth about the people she thought loved her most.