Technosignature, previously known as SETI(search for extraterrestrial intelligence), is the scientic evidence of past or present extraterrestrial civilizations. Since NRAO's Project Ozma was performed in 1960, most of the noticeable technosignature searches have been done by radio telescopes, hoping to find strong and narrow bandwidth signals that cannot be explained by known natural processes. Recently, the Breakthrough Listen project has opened a new opportunity for technosignature by utilizing both optical telescopes, radio telescopes, and next-generation radio telescope arrays. In this review, mainly based on NASA Technosignatures Workshop (2018), we review the current trends of technosignature surveys, as well as other possible methods for detecting technosignature. Also, we suggest what the Korean community could contribute the technosignature research, including the new SETI project with Korea VLBI Network (KVN).

• Sungwook E. Hong(Korea Astronomy and Space Science Institute, University of Science and Technology) Corresponding author
• Bong Won Sohn(Korea Astronomy and Space Science Institute, Daejeon 34055, Korea)
• Taehyun Jung(Korea Astronomy and Space Science Institute, Daejeon 34055, Korea)
• Min-Su Shin(Korea Astronomy and Space Science Institute, University of Science and Technology)
• Hyunwoo Kang(Korea Astronomy and Space Science Institute, Daejeon 34055, Korea)
• Minsun Kim(Korea Astronomy and Space Science Institute, Daejeon 34055, Korea)