According to German media Biography today, South Korean naturalized international player Castrop, who plays for Borussia Mönchengladbach, may need to serve in the military. South Korean media denied the rumors that players with innate dual-nationality like Castrop can be exempted from serving in the military if they meet the conditions.

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South Korean media said that Castrop's military service obligations do not seem to constitute a substantial obstacle at the moment. According to the South Korean Military Service Law, if a person with congenital multinationality like him lives overseas for a long time, he will automatically be transferred to wartime labor service after the age of 37, and will be exempted from active military service obligations. However, it must be met before the age of 37: 1) The cumulative residence in South Korea shall not exceed six months within any natural year; 2) No profit-making activities such as employment are allowed in South Korea.

As the first foreign mixed-race player to represent South Korea, Castrop has made his national team debut in September this year.

Castrop, 22, plays as a midfielder on the field. He has played for Borussia Mönchengladbach this season, and the price of Germans is 6 million euros. His father is German and his mother is Korean.