Jonghyun Song received a B.S. degree in chemical engineering from Chung-Ang University, Seoul, Korea, in 2017. He worked as a poled process engineer until 2019 at the LG Display Co. Ltd. In 2019, he joined the National Nanofab Center, Daejeon, Korea, where he engaged in the field of diffusion process. From 2022, he has been pursuing an M.S. degree in electronic engineering from the Chungnam National University, Daejeon, Korea. His research interests include 3D heterogeneous integration technology.