We are very happy to welcome you all in Seoul, Korea and are confident that the situation is improving regarding the on-going COVID-19 pandemic. From July 1, 2021, people vaccinated abroad will no longer be required to lock themselves up for two full weeks. Nevertheless, in view of the possible travel restrictions, the conference will be in the form of a hybrid conference with as many authors and participants as possible attending the conference in Seoul in person, and others attending remotely.