Loosely adapted from the movie '17 again', the drama has turned the trope into an amazing life-lesson without necessarily guilt-tripping and dictating. Some acts seem candid to the nature of the story. However, it still upsets me that the main character seems to act so recklessly during the transformation. I realized at the end that it is a part of the main character's character development. I am not comfortable either about the fact that an '18-year-old' body still chases and act like 'thirty-seven' so much, especially around the wife, Da-Jeong. This drama fills the void of regrets I have in life, comforting too.