We were pleased to welcome Hong Thi Bui and Jose Reina-Galvez from the Center for Quantum Nanoscience at our institute. Both shared their expertise on ESR-STM with us, by giving insightful talks and engaging in fruitful discussions. While Hong showed us remarkable results from her ESR-STM experiments, Jose dives into the depth of modeling ESR-STM measurements and enriches the theoretical understanding of the experimental method.