SungUn majored in object design at the School of the Art Institute of Chicago, embarking on her design career in New York and Italy before returning to Korea to establish YOLK. Its first innovation, Solar Paper, is a paper-thin solar charger, which has also won the CES Innovation Award. Solar Paper raised US$1 million on Kickstarter. SungUn CHANG was inspired to launch the Solar Cow project to solve two challenges: one in five children in Africa cannot go to school due to the prevalence of child labor; while 80% of people in rural areas do not have access to electricity. Solar Cow won the CES Innovation Award 2019, AidEx 1stprize, iF Social Impact prize, and Green award, and wased as a partnership project at the P4G summit in 2021.