得陇望蜀 Obtain Long, desire Shu
Explanation
比喻贪得无厌，已经得到一样东西，还想得到更多。
This idiom describes the insatiable greed for more after already obtaining something.
Origin Story
话说东汉光武帝刘秀建立东汉后，先后平定了河北、河南等地的割据势力，巩固了统治。然而，西部的蜀地和陇西地区，却还有强大的势力割据一方，对东汉政权构成了严重的威胁。其中，蜀地由公孙述占据，陇西则由隗嚣控制。为了彻底扫平这些割据势力，光武帝决定先讨伐陇西的隗嚣，在隗嚣大败之后，刘秀又挥师南下，一举攻破了蜀地。有人称赞光武帝的战略眼光，但也有人忧虑，担心他得了陇西，还要攻打蜀地，这会过于贪心，容易造成内乱。这种担忧并非没有道理，因为连年的征战已经让百姓苦不堪言。虽然光武帝最终平定了蜀地，统一了全国，但他的这种“得陇望蜀”的行为，也给后世留下了一个警示：凡事要量力而行，贪得无厌只会给自己带来灾难。
After the establishment of the Eastern Han Dynasty by Emperor Guangwu of Han, he successively quelled the separatist forces in Hebei, Henan and other areas, and consolidated his rule. However, the western regions of Shu and Longxi still had strong forces, posing a serious threat to the Eastern Han regime. Among them, Shu was occupied by Gongsun Shu, and Longxi was controlled by Kui Xiao. In order to completely eliminate these separatist forces, Emperor Guangwu decided to attack Kui Xiao in Longxi first. After Kui Xiao's defeat, Liu Xiu led his troops south and captured Shu in one fell swoop. Some praised Emperor Guangwu's strategic vision, but others worried that after taking Longxi, he would attack Shu, which would be too greedy and easily lead to internal strife. This concern was not without reason, as years of warfare had made the people suffer unbearably. Although Emperor Guangwu finally pacified Shu and unified the country, his "getting Long and wanting Shu" behavior also left a warning to posterity: one must measure one's strength and not be insatiable, as this will only bring disaster.
Usage
常用来形容一个人贪得无厌，不知足。
It is often used to describe a person who is greedy and insatiable, never satisfied.
Examples
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他这个人真是得陇望蜀，一点也不满足。
tā zhège rén zhēnshi délóngwàngshǔ, yīdiǎn yě bù mǎnzú.
He is really insatiable, never satisfied.
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公司已经取得了阶段性胜利，但是有些人却得陇望蜀，想要独占所有功劳。
gōngsī yǐjīng qǔdéle jiēduānxìng shènglì, dànshì yǒuxiē rén què délóngwàngshǔ, xiǎng yào dúzhàn suǒyǒu gōngláo
The company has already achieved a phased victory, but some people are insatiable and want to take all the credit for themselves.