Jo Yunjae had dedicated 20 years of his life to opera. However, after he hardly failed at an interview to enter the Performing arts High School, he lost all of his motivations. Depressed, he started depending on alcohol to live his life until one day, he was sent 20 years back in time, to the day before his high school admission. Neither the reason for his time travel nor the terrible condition he found his body in mattered to him. The one and most important thing was that he could sing anew as the long-wished tenor.