Question: Who is the wife of Kim Jong-chul?

full_context: Document 1: Kim Jong-nam: Kim Jong-nam was born 10 May 1971 in Pyongyang, North Korea, to Song Hye-rim, one of three women known to have had children with Kim Jong-il. Because Kim Jong-il aimed to keep his affair with Song a secret due to the disapproval of his father Kim Il-sung, he initially kept Jong-nam out of school, instead sending him to live with Song's older sister Song Hye-rang, who tutored him at home. North Korea Leadership Watch says he left North Korea to visit his grandmother in Moscow, Soviet Union, and spent his childhood at international schools in both Russia and Switzerland until returning to his home country in 1988.
Document 2: Kim Jong-il: Soviet records show that Kim was born Yuri Irsenovich Kim () in 1941 in the village of Vyatskoye, near Khabarovsk, where his father, Kim Il-sung, commanded the 1st Battalion of the Soviet 88th Brigade, made up of Chinese and Korean exiles. Kim Jong-il's mother, Kim Jong-suk, was Kim Il-sung's first wife. Inside his family, he was nicknamed "Yura", while his younger brother Kim Man-il (born Alexander Irsenovich Kim) was nicknamed "Shura".
Document 3: Yuri Nagibin: Yuri Nagibin was born in Moscow in 1920. Nagibin's mother Ksenia Nagibina was pregnant with him when his father — Kirill Nagibin, a Russian nobleman — was executed as a counter-revolutionary before he was born. He was raised by a Jewish stepfather Mark Leventhal who was also later arrested and sent into internal exile to the Russian North in Komi Republic in 1927. Nagibin was unaware of his real father, so he assumed he was partly Jewish (Nagibin's mother was of Russian ethnicity). He found out late in life that both of his parents were in fact Russian, but he consciously related himself to Jews and condemned antisemitism, having suffered many antisemitic incidents in his early life.
Document 4: Hyon Chol-hae: During the Korean War, Hyon served as Kim Il-sung's bodyguard, a role which gave him "a place in North Korea's revolutionary history". He was director of the General Logistics Department of the Korean People's Army from 1986 to 1995, when he was appointed deputy director of the General Political Department, becoming one of the senior most members of the North Korean military and political leadership. He has been described as being in "close proximity" to Kim Jong-il, and as reporting directly to him. It had been suggested that, following Kim Jong-il's death, he may have taken part in a military council leadership of the country. He was transferred to director of the Standing Bureau of the National Defence Commission. He has been a member of the Central Committee of the Workers' Party of Korea since 1991.
Document 5: Kim Pyong-il: Kim Pyong-il (; born 10 August 1954) is the younger paternal half-brother of the former leader of North Korea, Kim Jong-il, and the only surviving son of former leader and president of North Korea Kim Il-sung. He is the current ambassador of North Korea to the Czech Republic.
Document 6: Communism in Korea: Alexandra Kim, a Korean who lived in Russia, is sometimes credited as the first Korean communist. She had joined the Bolsheviks in 1916. In 1917, Vladimir Lenin sent her to Siberia to mobilize Koreans there against the counter-revolutionary forces and the Allied Expeditionary Forces. In Khabarovsk Kim was in charge of external affairs at the Far - Eastern Department of the Party. There she met with Yi Dong - Wi, Kim Rip and other Korean independence fighters. Together they founded the Korean People's Socialist Party, the first Korean communist party on June 28, 1918.
Document 7: Kim Il-sung Square: Kim Il-sung Square is a large city square in the Central District of Pyongyang, North Korea, and is named after the country's founding leader, Kim Il-sung. The square was constructed in 1954 according to a master plan for reconstructing the capital after the destruction of the Korean War. It was opened in August 1954. The square is located on the foot of the Namsan Hill, west bank of the Taedong River, directly opposite the "Juche" Tower on the other side of the river. It is the 37th largest square in the world, having an area of about 75,000 square metres (807,293 square feet) which can accommodate a rally of more than 100,000 people. The square has a great cultural significance, as it is a common gathering place for rallies, dances and military parades and is often featured in media concerning North Korea.
Document 8: Kim Yong-ju: Kim Yong-ju was born to Kim Hyŏng-jik and Kang Pan-sŏk in Mangyongdae in 1920, 8 years after his elder brother Kim Il-sung. When Kim was 3 years old, his family moved to southern Manchuria.
Document 9: Kim Jong-chul: Kim Jong-chul (born 25 September 1981), sometimes spelled Kim Jong Chol, is a son of former North Korean Supreme Leader Kim Jong-il. His younger brother is Kim Jong-un, now the leader of North Korea. His older half-brother was Kim Jong-nam, who was assassinated in February 2017.
Document 10: Chinese characters: After Kim Jong Il, the second ruler of North Korea, died in December 2011, Kim Jong Un stepped up and began mandating the use of Hanja as a source of definition for the Korean language. Currently, it is said that North Korea teaches around 3,000 Hanja characters to North Korean students, and in some cases, the characters appear within advertisements and newspapers. However, it is also said that the authorities implore students not to use the characters in public. Due to North Korea's strict isolationism, accurate reports about hanja use in North Korea are hard to obtain.
Document 11: Kim Jong-un: Scarce information on Kim Jong - un's early life comes from North Korean defectors and people who have claimed to witness him abroad, such as during his school attendance in Switzerland. Some of the information has been conflicting and contradictory, perhaps confusing him with his brother, Kim Jong - chul, who also attended school in Switzerland around the same time. Nevertheless, there has been some consensus on information about his early life. North Korean authorities have stated that his birthdate is 8 January 1982, but South Korean intelligence officials believe the actual date is a year later. Former basketball star Dennis Rodman said that the birthdate is 8 January 1983 after meeting Kim in September 2013 in North Korea. Kim Jong - Un was the second of three children Ko Yong - hui bore to Kim Jong - il; his elder brother Kim Jong - chul was born in 1981, while his younger sister, Kim Yo - jong, is believed to have been born in 1987.
Document 12: Ko Yong-hui: Ko Yong-hui (; 26 June 1952 – 13 August 2004), also spelled Ko Young-hee, was the North Korean supreme leader Kim Jong-il's consort and the mother of North Korea's current leader, Kim Jong-un. Within North Korea she is only referred to by titles, such as "The Respected Mother who is the Most Faithful and Loyal 'Subject' to the Dear Leader Comrade Supreme Commander", "The Mother of Pyongyang", and "The Mother of Great Songun Korea."
Document 13: Kim Il-chol: He was born in Pyongyang in 1933. He graduated from Mangyongdae Revolutionary School and the "Soviet Union Naval Academy". Although the North Korean army mainly depends on ground troops, Admiral Kim who was commander of the Korean People's Navy since 1982 was installed in the highest military position of the head of the Minister of the People's Armed Forces in 1998, filling a vacancy left by Choe Kwang, who died in February 1997, something that indicated that he was fully trusted by Kim Jong-il. Kim Il-chol participated as a senior delegate in the inter-Korean Defense Minister’s meeting held for the first time since the division of the Korean peninsula in September 2000.
Document 14: An Kyong-ho: He was born in Gangwon, and is a graduate of Kim Il-sung University in Pyongyang. He currently serves as the Chief Director of the Committee for the Peaceful Reunification of the Fatherland. He first entered international news in 1988, when he attended South-North preparatory talks. He was a delegate to the 9th and 11th sessions of the Supreme People's Assembly, held in 1990 and 2003.
Document 15: With the Century: Reminiscences: With the Century () is the autobiography of Kim Il-sung, founder and president of North Korea. The memoirs, written in 1992 and published in eight volumes, retell Kim's life story through his childhood to the time of Korean resistance. Initially, a total of 30 volumes were planned but Kim Il-sung died in 1994 after just six volumes; the seventh and eight volumes were published posthumously. The work reveals early influences of religious and literary ideas on Kim's thinking. An important part of North Korean literature, "With the Century" is held as a valuable if somewhat unreliable insight into the nation's modern history under late colonial Korea. The book is considered one of a few North Korean primary sources widely available in the West and as notable research material for North Korean studies.
ground_truth: Kim Jong-suk
sub_queries: Kim Jong-chul >> father Answer: Kim Jong-il
Who is the mother of Kim Jong-il ? Answer: Kim Jong-suk