Monica J is a South Korean harmonica player who graduated from the Music Department of Korea Arts University. She serves as the chief of the Seoul Soloists Harmonica Orchestra, with superb skills and outstanding expressiveness, playing a core leading role in the orchestra, and is also a global artist of EASTTOP. His book "What's the point of idleness? Why not play the harmonica!" takes a unique perspective and professional insights to introduce the charm of the harmonica to the public. Monica J is active in various music events and competitions: she has held solo speeches and concerts at the Starfield Coex Star Square Library in the New World; Won first place in the ensemble competition at the 7th APHF China Hangzhou Station; Served as a judge for music programs multiple times, such as the first K-Harmonica Festival in 2017 and KBS2's "Who's Doing It Well" judge; Also participated as a performer in programs such as KBS2's "Immortal Songs 2" and SBS's "Fantasy Duo". Her performances have been both domestic and international. In 2019, she held a solo performance in Osaka, Japan. In 2020, she was invited to participate in MISS KOREA Busan&Ulsan performances. In 2022, she held a signing and concert for the author of "Why Not Play the Harmonica?" at the Gwanghwamun Educational Preservation Library. In addition, she opened the MONICA J channel on Youtube to share her music works and daily performances, gaining a lot of fan attention.