People who visited the Grand Prince Hotel Akasaka in Chiyoda Ward, Tokyo, may have stepped into the old two-story Guest House, which stands behind the 40-story main hotel.

The Guest House now hosts a renowned French restaurant, Le Trianon, the Napoleon Bar and several banquet halls.

What is not generally known is that this luxurious structure, built in 1930, was once the residence of Crown Prince Yi Eun (1897-1970), the last crown prince of Korea, and his Japanese wife, Crown Princess Masako (1901-1989), during the war and early postwar period.