Just a note on Daum search. DAUM merged with KAKAO some years ago. I don't know the details of the merger.
Samsung Data Center used by Kakao burned Saturday afternoon. I don't know the extent of the damage. At about 3:30 power was shut off to the building and KAKAOTALK went down. Kakaotalk began to work partially Sunday afternoon.
I don't know all the services which are still offline. I don't use much of kakao-daum services.
Supposed some Naver was also effected but not like Kakao was. It seems every service of kakao went down.