Kim Young-bum

What details and individuals were on the list?

The list included the names, job positions, birthdates and passport information of the President, First Lady, then Director of National Policy Kim Yong-beom, National Security Advisor Wee Sung-nak, Science and ICT Minister Bae Kyung-hoon, Foreign Minister Cho Hyun and members of the press corps.

It also included data linked to presidential officials whose identities have not been disclosed to public, including Secret Service agents, the President's medical team, and those in charge of the president's and first lady's hair and makeup.

And how has the top office reacted? The presidential office held an emergency meeting chaired by Chief of Staff Im Kwang-hyun this morning.