Mr. Maybe Mine

When Kim Min-Seok wakes up in a hospital, he's stunned to find two handsome men both claiming to be his lovers. Dismissing it as a prank, he prepares to leave, only to see an unfamiliar face in the mirror. Min-Seok is now in the body of Seo Ha-Yoon, an evident two-timing schemer. Who was Seo Ha-Yoon