Insil was born and raised in South Korea. She earned her Associate of Art degree at Kaywon School of Art & Design, studying animation. After graduating, she worked as a junior designer at two Korean animation companies in the cities of Seoul and Uiwang. She decided to study abroad to further educate herself in a complementary field of art and illustration and earned a Bachelor of Fine Art degree at Rhode Island School of Design in Providence, RI. During her studies at RISD Insil began to pursue her a career in medical illustration and as a freelance artist in Boston, she produced two illustrations for covers of the scientific journals Nature and Cell. She received a Master of Art degree at Medical and Biological Illustration program in the Department of Art as Applied to Medicine at Johns Hopkins University School of Medicine in Baltimore, MD. For her thesis project, she created a VR simulation app that trains users in an autopsy brain removal procedure.