Group 2pm Junho, Girls' Generation Im Yoon-ah, and broadcaster Jang Sung-kyu are in charge of MC at '2021 MBC Song Festival' held at MBC Dream Center in Ilsan, Gyeonggi Province on the afternoon of the 31st.
About Im Yoon-ah
Im Yoon-ah, known mononymously as Yoona, is a South Korean singer and actress. After training for five years, she debuted as a member of girl group Girls' Generation in August 2007, which went on to become one of the best-selling artists in South Korea and one of South Korea's most popular girl groups worldwide.
 Wikipedia