Fire Emblem isn't a game for 7 year olds. Fire Emblem target area is higher teens to college students. Around that age, parents usually don't buy their child anything relating to gaming yet the child themselves have to provide for themselves.
I'm sure Nintendo of Korea does still the same risks as we do. But keep in mind, the only reason why the Fire Emblem series was brought to Korea was because Koreans sent messages/letters to the Nintendo of Korea requesting to bring Fire Emblem over. Seeing that, the request amount was probably high enough for Nintendo of Korea to allow it. Also, those who were request most likely understands Fire Emblem comes from Japan so there will be some influences. There probably will be some more censorship and other localizations so it could appeal to more Koreans but not going as far as changing story and areas. But, who really knows what Nintendo of Korea plans to do with Fire Emblem, all we can do is wait for more news and for September 8th.
At the end of the day though, I glad that Fire Emblem is being released to Korea. Whether or not Fire Emblem is enjoyed/welcomed in Korea, its nice to see a once-dying franchise being revived and spread to even more countries.