Francis founded the Caritas Choir, which hosted annual concerts from its inception in 2001 until 2010. The Choir's success brought joy to the Korean and Greater Boston community, fostering a powerful bond through music and raising the profile of the Korean Catholic Community. He views it as his apostolic mission to find and share the meaning of faith with others through singing and praise.

Ever since beginning his career as a conductor, Francis has been deeply interested in helping singers of all skill levels achieve fulfillment through healthy vocal technique, with particular emphasis on breathing. His whole-body approach to singing draws upon both practical experience and academic research. Francis believes in the transformative power of music and the authenticity of the human voice—especially that of amateur singers. Guided by the conviction that anyone can become a capable singer with proper training, he founded the Boston Korean Singers in 2013. Since then, the ensemble has flourished, presenting numerous concerts and community performances. Notably, the Bibim Concert in 2019 and Bibim II Concert in 2022 attracted large audiences, combining musical performance with a cultural exchange, as audiences were invited to share Korean bibimbap following the concerts.

His voice is distinguished by its rich tonal variety and resonant depth. More than technical mastery, it is his ability to move the hearts of his listeners that reflects his belief that singing is ultimately an art of emotion beyond technique. As both a vocal instructor and conductor for the Korean Catholic Church, Francis continues to inspire and uplift others, extending his influence throughout the local community and beyond.