Dong-hyun is a high school student. One day, he falls from the rooftop and bumps into Pan-soo who is a passerby. Pan-soo is a member of a criminal organization. When the two men wake up in the hospital, they discover that they have switched bodies.
A story about the love of men and women who reunited with the 'Login' dating app.
Lee Jae-In possesses a good appearance, he is smart and comes from a wealthy family, but he is also arrogant. His grandfather orders Jae-In to enter into a 10 month contract engagement with a female school teacher that he has never met in his life. Lee Jae-In slowly falls in love with her.
