Question: Who is the paternal grandfather of Yi Hong?

Context paragraphs:
title: Prithvipati Shah
paragraph_text: Prithvipati Shah( ?–1716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal. He was the grandfather of Nara Bhupal Shah.
title: Queen Uihye
paragraph_text: Queen Uihye was biological mother of Yi Seong- gye who was the founder of Joseon Dynasty.
title: Kaya Alp
paragraph_text: Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
title: Lyon Cohen
paragraph_text: Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist. He was the grandfather of singer/ poet Leonard Cohen.
title: Yi Hong
paragraph_text: Yi Hong( born 1974 in Seoul) is a descendant of the Joseon Dynasty rulers, who works as a model and entertainer. She is the eldest daughter of His Highness Prince Yi Seok of Korea by his second wife, Donkgo Jeonghui, and a great- granddaughter of Emperor Gojong of the Korean Empire. She is commonly referred to as" the last Imperial princess" by the public in South Korea.
title: Guillaume Wittouck
paragraph_text: Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate. He was the Grandfather of industrialist Paul Wittouck.
title: Yi Seok
paragraph_text: Prince Yi Seok (born 3 August 1942) is the head of the House of Yi, the Korean imperial household. He was described as "the last prince still living on Korean soil, the last pretender to an abolished throne" by "The New York Times". Yi gained fame as the "singing prince" with the wedding favorite "Pigeon House", released in 1967. Since 2004, he has been employed by the city of Jeonju to promote tourism. He is also a professor of history at Jeonju University. He is a son of Prince Yi Kang, the fifth son of Emperor Gojong of Korea, and his thirteenth wife, Lady Hong Chŏng-sun, a former telephone operator. Currently, Yi Seok resides in a building renovated for his use by the city of Jeonju, 243 kilometers south of Seoul. The city government hopes that Seok's settlement on the grounds of its Hanok Village will spotlight the historic significance of the city and help it to attract tourists. As part of this arrangement, Seok gives lectures to Jeonju visitors about Korean history. He also frequently lectures elsewhere and is often called upon for ceremonial duties, despite his official status as a private citizen. Recently, Seok authored a book about the late Joseon Dynasty royal court family and has founded an organization, which he now leads, "The Imperial Grandson Association", dedicated to preserving the culture of the royal court. The Republic of Korea owned website, Korea.net, recognizes Emperor Yi Seok as the only remaining heir in Korea.
title: Abd al-Muttalib
paragraph_text: Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
title: John Westley
paragraph_text: Rev. John Westley( 1636 – 78) was an English nonconformist minister. He was the grandfather of John Wesley( founder of Methodism).
title: Fujiwara no Nagara
paragraph_text: , also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period. He was the grandfather of Emperor Yōzei.

Reasoning steps:
Yi Hong father Yi Seok
Yi Seok father Prince Yi Kang

Answer: spans: Prince Yi Kang