I honestly can't see how people can consider this series to be incest. While the main characters were raised together, that doesn't change the fact that they are not blood-related and thus would be better considered really good childhood friends than actual family. In this way, I don't see how the main characters falling in love would be any different than all those other series where the male lead and the heroine are neighbors, childhood friends, are practically raised together, and then eventually fall in love.