Co-founder and CTO of LetinAR, Jeong-Hun Ha discovered the pinhole effect through a mirror while observing a partial solar eclipse during his high school years, which became the base concept of the PinMR™. In 2016 he founded LetinAR and in 2018 he invented the PinTILT™ structure which received extensive positive responses during CES 2022 & 2023 for its all-around high performance and simple structure.

Jeong-Hun received a B. S. degree in Materials Science and Engineering from Hongik University. In 2020 he was named on The Forbes 30 Under 30 Asia List.