A former North Korean diplomat has won a seat in South Korea's National Assembly.Thae Yong Ho was a candidate in the South Korean parliamentary elections on Wednesday.He became the first North Korean to have fled the North and won an assembly seat. Tens of thousands of North Koreans live in South Korea.Thae was elected to represent voters in the mostly wealthy Gangnam neighborhood in Seoul.He was a former minister at the North Korean embassy in London. He defected and resettled in South Korea with his family in 2016."Republic of Korea is my motherland," an emotional Thae said at his campaign office."I thank you (Gangnam voters) for selecting me to become the first (defector) from North Korea to win a constituency ... I'll only uphold your order and work hard."Thae later bowed deeply and waved his hands, making his fingers in the shape of the letter V.He started singing South Korea's national anthem with supporters as tears came to his eyes.