Why is there a bad corner in house geomantic omen?

First of all, what you said is not correct. It's just that some people say that feng shui is not good without horns. In fact, this is not the case.

The lack of corners does not mean that Feng Shui is not good, and a square house does not mean that Feng Shui is good.

Just as a good-looking person does not necessarily mean that he has a good future, a bad-looking person does not necessarily mean that he has no future. Some people who lack arms and legs get along well with the disabled.

Whether feng shui is good or not can not be judged by a simple condition. There are many factors that determine feng shui, which can only be judged by summing up.