When Kim Jong Un sat down in September to order the sixth and largest of North Korea's nuclear tests, Hwang Pyong So sat by his side, his khaki military uniform conspicuous among the suits at the table, photos released by state media at the time showed.
Now Hwang, once one of Kim's most-trusted advisers, is facing unspecified punishment on the orders of another man who also sat at that exclusive table in September, Choe Ryong Hae, South Korean intelligence officials believe.
Information on North Korea is often difficult to obtain, and with few hard details and no official confirmation from Pyongyang, analysts said it was too soon to draw any firm conclusions from the unspecified punishments.