She studied classical piano in her native South Korea and earned a master’s degree in Worship Leadership at Dallas Baptist University in Texas. Now she plays the piano and organ during worship services at the United Church of Christ Boxborough, and she teaches piano. So how did the musical Esther Kim get involved with baking?  “I felt that I needed to do something else, something in addition to teaching piano,” explained Kim. “I found that baking allows me to use a different part of my brain. It allows me to be creative.” Kim moved to Acton in 2023 from Michigan,…