From this hotel near the Olympic Village, people are preparing food such as the popular Korean dish, bulgogi.
It's for the athletes and is cooked without using any ingredients from Fukushima.
Starting at 4 AM every day, workers spend the entire day at the hotel making packed meals.
"There's no time to feel frustrated. I'm buried in work."
More than 400 meals are prepared every day.
Some ingredients have been brought from Korea like red pepper paste but fresh vegetables can be picked up from the local markets.
The cooks are not using any farm goods from eight regions in Japan including Fukushima, but measures are in place to make sure the produce is safe.
"We are using a machine to check radiation levels to see if the fruit and vegetables are safe."
South Korea is not only the country to bring its ingredients from home as the U.S. has done as well.
And while Japan says that it is offended by Korea, for not using ingredients from Fukushima, South Korea has actually been preparing meals for its athletes since the 2008 Beijing Olympics.
Jang Tae-hyun, Arirang News.