The Central Disease Control Headquarters of Korea announced that all overseas entrants will be exempt from isolation starting from June 8, which is the final phase of the post-Omicron revision of entry regulations, in consideration of the continued downward trend in new COVID19 cases in the nation and the stable pandemic situation abroad.
So please check the link below for entry in Korea
http://www.mohw.go.kr/eng/nw/nw0101vw.jsp?PAR_MENU_ID=1007&MENU_ID=100701&page=1&CONT_SEQ=371711
and also, please check the attached file for using Q-CODE system prior to departure so that you can present it upon arrival to Korea.