The Ministry of Food and Drug Safety (MFDS) of the Republic of Korea (Minister Oh Yu-Kyoung) takes part in the WNT (Working Group of the National Coordinators for the Test Guidelines Programme) meeting that is held at the OECD headquarters in Paris, France from April 24 to 29. It participates in the deliberation and approval of OECD guidelines and presents the current status of the liver organoid-based toxicity assessment (complex collections of cells that are three-dimensional tissue cultures derived from stem cells or cells of organ origin. Organoids replicate the structure and function of real organs. They can be used in various areas such as safety evaluation, efficacy evaluation, and the development of treatment) methods developed in Korea.