Dive into You is a body-swap time-slip romantic comedy. The story follows top actress Yoon Ha-na, who, after a near-fatal accident, travels back in time and wakes up in the body of her twin brother. To prevent the tragic death of her first love and loyal bodyguard, Jung Woo-jae (played by Park Seoham), who sacrificed his life for her in the previous timeline, she sets out to rewrite their fates and protect him at all costs.