Jeong Yun Ho, vice president of Top Entertainment and top actress Ju Yeong In’s husband, is a successful man, but despite all that he always feels empty inside.Would he be living a different life had he made a different choice? Ten years ago, he lost his precious smile. And now, suddenly his mobile phone rang."What the hell? I’m going to die?!?”But wait, it’s weird. He’s going back to his first year of life! The life of "first year max level manager” is just beginning."