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Republic of Korea
Practice Relating to Rule 107. Spies
The Republic of Korea’s Military Regulation 187 (1991) states that “executing the death penalty for spies … through summary trial not full trial” is an “unjustifiable crime”. 
Republic of Korea, Military Regulation 187, 1 January 1991, Article 4.2; see also Military Operations Law of War Compliance Regulation, Regulation No. 525-8, 1 November 1993, Statute 525-8 of United Nations Command/Combined Force Command (UNC/CFC), Statute of Observing Laws of War of 15 December 1988, § D.
According to the legal adviser of the Ministry of Foreign Affairs of the Republic of Korea, a captured spy who is a member of enemy armed forces cannot be deemed a prisoner of war and may be punished under national law. 
Republic of Korea, Opinion of a legal adviser of the Ministry of Foreign Affairs concerning the North Korean Submarine Infiltration Case, September 1996, Report on the Practice of the Republic of Korea, 1997, Chapter 1.1.