Mansoon is frequently on demand as both soloist and chamber musician in many major cities in Japan, as well as in the UK where she is currently based.
She was born in Japan of Korean origin. She began studying the violin at the age of three in her native city of Osaka. Later she proceeded to the Royal Academy of Music in London where she worked first with Richard Deakin and then with Mayumi Fujikawa for Bachelor and Master's Degree, in which she is a recipient of full scholarship, namely the Derek Butler Scholarship, the Bratton Scholarship and Leverhulme Scholarship.
Mansoon has been awarded prestigious prizes including David Martin/Florence concerto Prize at the Royal Academy of Music where she was also a recipient of the Poulett Scholarship and the Bloch Award. In 2008, Mansoon won the First Prize and the Audience Prize in The Cavatina Music Competition and most recently, she has been chosen to receive the Byram Jeejeebhoy Prize as well as the Silver Medal Prize which is awarded to students who has made the most outstanding contribution to the work and to performance activities.