Hello. It seems that you have deleted my edit on the article of gensokyo. May i ask why do you think this edit of mine was wrong and is unreadable? If it was because i have bad grammar, i get it, but i got the source of information from nico nico Wikipedia, which a lot of Japanese users used, and another Wikipedia site called 'namu wiki' where a huge amount of koreans use for a source of information.
In the nico nico wiki, it's stated as "しかし、500年以上前、人間の文明の発達と人口の増加により妖怪の勢力が人間に押され気味だったため、境界を操る程度の能力を持つ妖怪、八雲紫が「妖怪拡張計画」を立案・実行して「幻と実体の境界」という結界を張った。 これにより単なる山奥であった幻想郷は、結界の作用により「幻となったものを自動的に呼び寄せる土地」へと変化し、外国を含む外の世界で勢力の弱まった妖怪が幻想郷へ来ることになった。"
In the namu wiki, it's stated as "시간이 흘러 기술과 문명의 발달로 인간의 세력이 늘어나 요괴들과 환상향이 위험에 빠지는 것을 염려한 요괴의 현자인 야쿠모 유카리, 마타라 오키나 등에 의해 약 500년 전, 환상향에 환상과 실체의 경계가 쳐지게 된다. "
Both the wikis say that before the great hakurei barrier, the sages put up another barrier that divides fantasy and reality which was 500 years ago, and i edited this page's gensokyo just like that too. May i hear the source of your information too to see if i had made any mistakes?