Junhee Choi received his Ph.D degree in the department of Mechanical and Aerospace Engineering from Seoul National University in 2019. He conducted the development of ultrasonic device for root canal treatment, patter formation of cracks in bloodstain, and nature’s mechanisms for fluid transport. Currently, he is a researcher in DGIST-ETH Microrobotics Research Center (DEMRC) at Daegu Gyeongbuk Institute of Science and Technology (DGIST) in South Korea.