On May 28th, KBS's "Yoo Hee Yeol's Sketchbook" broadcasted yet another special in celebration of their 100th episode. As previously reported, "Sketchbook" is planning to spotlight the underrated areas in the music industry to commemorate their milestone. On today's episode, the theme centered around "The Drama", and so singers Jung Yeob, Baek Ji Young, Yurisangja, Sweet Sorrow, Seo Young Eun, Super Junior's Yesung, Clazziquai, and Cha Soo Kyung were brought in to perform their very own OST hits. Jung Yeob performed "There Was Nothing" from the "49 Days" OST, while Baek Ji Young sang "That Woman", an ultra-popular track from "Secret Garden". Clazziquai made a much-anticipated return with "She Is" from "My Name is Kim Sam Soon", and Super Junior's own vocalist Yesung performed "It Has to Be You" from "Cinderella's Sister". In the interview portion of the show, Baek Ji Young joked around with her fellow "I Am a Singer" castmate: "This is KBS, right? Guesting on this show with Jung Yeob is confusing me." Yoo Hee Yeol wittily said, "You will not be able to compete again today. How was the survival stage for you?" Jung Yeob replied, "It was just an honor." Baek Ji Young added, "This is my 13th year as a singer and it still made me shake with nervousness." Check out the performances below! -- < Jung Yeob - There Was Nothing || "49 Days" OST > < Baek Ji Young - Don't Forget Me || "IRIS" OST > < Baek Ji Young - That Woman || "Secret Garden" OST > < Yesung - It Has to Be You || "Cinderella's Sister" OST > < Clazziquai - She Is || "My Name is Kim Sam Soon" OST > == Source + Photos: BNT News via Nate