18-year-old Kang Gyung-joon’s spirit suddenly ends up in the body of 30-year-old doctor Seo Yoon-jae, who is engaged to his high school teacher, Gil Da-ran. Things become even more complicated when Yoon-jae falls in love with another woman.

• Gong Yoo
• Lee Min-jung
• Suzy
• Jang Hee-jin
• Shin Won-ho
• Jang Hyun-sung
• Koh Soo-hee
• Im Ji-eun