九霄云外 beyond the nine heavens
Explanation
九霄云外是一个成语，指的是非常遥远的地方，比喻事情已经离自己很远，或者已经完全消失不见了。
"Jiu Xiao Yun Wai" is a Chinese idiom that means a very distant place, implying that something is far away from oneself or has completely disappeared.
Origin Story
传说天上有九层天，每一层都住着不同的神仙。而“九霄云外”就指的是最上面那层天的外面，那里是凡人无法到达的地方。在古代，人们常常用“九霄云外”来形容那些遥不可及的事物，比如梦想、希望、爱情等等。
Legend has it that there are nine layers of heaven, each inhabited by different gods. “Jiu Xiao Yun Wai” refers to the area outside the topmost layer of heaven, a place that is inaccessible to mortals. In ancient times, people often used “Jiu Xiao Yun Wai” to describe things that are unattainable, such as dreams, hopes, love, and so on.
Usage
九霄云外常用于形容事情已经过去了很久，或者已经完全消失不见了。例如：他已经把这件事忘得九霄云外了。
"Jiu Xiao Yun Wai" is often used to describe something that has passed a long time ago or has completely disappeared. For example: He has long forgotten about this matter.
Examples
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他这个人就是太天真了，总是把别人的话当真，把事情想的过于简单，简直是九霄云外，毫无戒备。
ta zhe ge ren jiu shi tai tian zhen le, zong shi ba bie ren de hua dang zhen, ba shi qing xiang de guo yu jian dan, jian zhi shi jiu xiao yun wai, hu wu jie bei.
He is just too naive. He always takes what people say seriously and thinks that things are too simple. He is completely unprepared.
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这个方案太不现实，简直是九霄云外，与实际情况相差太远了！
zhe ge fang an tai bu xian shi le, jian zhi shi jiu xiao yun wai, yu shi ji qing kuang xiang cha tai yuan le!
This plan is simply not realistic, it is totally unrealistic and too far from the actual situation!