APSTH 2021 Virtual was held from March 18 - 20, 2021. 03/25,2021 APSTH 2021 Virtual was held from March 18 - 20, 2021. The congress was possible with the great continuous effort of the local organizing committee of APSTH 2021. APSTH members vigorously participated as speakers and presenters. The network among clinicians and researchers in thrombosis and hemostasis of the world was strengthened. All APSTH members are grateful for the local organizing committee and KSTH, who worked hard for this important congress under the very difficult circumstance of COVID-19 pandemic. We all congratulate KSTH members and Dr. Myung Ho Jeong (Chairman of APSTH 2021), Dr. YoungKeun Ahn (Secretary General of APSTH2021), and Dr. Soo-Mee Bang (Scientific Committee Chair of APSTH2021).