In the course of a research exchange between POSCO and the Chair of Ferrous Metallurgy Mr. Sang-Woon Moon joined the research group Continuous Casting and Cleanness from Dec. 2019 to Dec. 2020. POSCO, the steel producer from Korea, is known all over the world for highly sophisticated and excellent research activities. There is a long-standing history of beneficial research cooperation between POSCO and the Chair of Ferrous Metallurgy. Although the stay of Mr. Sang-Woon Moon was a bit clouded because of the pandemic situation in the year 2020, it was a pleasure to have him in the working group due to fruitful discussions and very good exchange of knowledge. We will stay in ongoing contact and wish Mr. Sang-Woon Moon all the best.