If you are wondering why police are not disclosing more information about the political ideology of the suspect who stabbed Lee Jae-myung, it is because of a law that prevents them from doing so:
The decision by the police not to disclose the political affiliations of the man who attacked Rep. Lee Jae-myung, the leader of the main opposition Democratic Party of Korea (DPK), with a knife, has sparked controversy. The DPK has criticized law enforcement authorities for sharing investigative information selectively.
The Busan Metropolitan Police Agency announced, Monday, that its identity disclosure committee would convene a meeting on Tuesday to determine whether to release the personal information of the 67-year-old male suspect, identified so far only by the surname Kim.
If the committee decides in favor of further disclosure, Kim’s full name, age and photo will be released.
However, the police stressed that the history of his political affiliations would remain undisclosed, irrespective of the committee’s decision.
“Technically, it cannot be disclosed as per relevant laws. We are currently discussing with the prosecution about the matter. But if we disclose (his political affiliations), there could be penalties,” an official at the Busan Metropolitan Police Agency said during a press briefing.
The official was referring to the Political Parties Act, which bans investigative bodies from publicly sharing information about a suspect’s political affiliations that could be ascertained during investigations. Violation of this law may lead to imprisonment of up to three years.
Korea Times
You can read more at the link, but police could face up to 3-years in jail if they released the information.