Haedeun Lee was born in Seoul, South Korea. From the age of twelve she was selected as a prodigy by the Kumho Cultural Foundation to give recitals in Korea and Germany. She entered the pre-college division of the Korean National University of Arts to study cello and later graduated from Yewon School, the Seoul Arts High School and the Seoul National University where she received the Excellence in Music Prize. Haedeun Lee holds a Master of Music degree and a Konzertexamen degree from the Berlin University of the Arts (UDK) and the Rostock University of Music and Theatre respectively. Her teachers included Wolfgang Boettcher, Principal Cello of the Berlin Philharmonic and Julian Steckel.
She has performed as an academy and tutti cellist with the Berlin Radio Symphony Orchestra, the Leipzig Gewandhaus Orchestra and the Staatskapelle Dresden. Her experience includes concerts in prestigious concert halls including the Berliner Philharmonie, the Musikverein in Vienna, the Carnegie Hall in New York and collaborations with world-renowned conductors including Marek Janowski, Riccardo Chailly, Christian Thielemann, Herbert Blomstedt, Riccardo Muti, Myung-Whun Chung and Jaap Van Zweden.
Following her successful career in Europe she was invited to join as the principal cellist of City Chamber Orchestra of Hong Kong in 2020.
Haedeun joined the cello section of the Hong Kong Philharmonic Orchestra in 2023.