His character, Kim Yoo Chan, appears to be someone heavily desired in public and even has the nickname of "Mr. Sunshine" among fans for his bright smile all the time. But under all of that, he is a lonely boy covered in scars. Yoon Ji Sung, who was cast as the lead role for the first time, will be making his acting debut through the drama. The "Energetic" singer showed his stable acting skills in musicals such as "The Days" and "Return: The Promise of the Day," which started his leap as an actor. Fans are anticipating the return of Yoon Ji Sung and what kind of character and skills he will sh...