What would happen if the judicial branch exist?

Without the judicial branch, there would be no system of checks and balances to ensure that the other two branches of government (the executive and legislative branches) do not become too powerful. The judicial branch is the only branch of government that can declare laws passed by the legislative branch unconstitutional. It can also interpret laws and decide how they should be applied in individual cases.

Without the judicial branch, the executive branch would be able to do whatever it wanted, without fear of being challenged by the other two branches of government. The executive branch could, for example, make laws without the approval of the legislative branch, or it could refuse to enforce laws that it did not like.

Without the judicial branch, the legislative branch would be able to pass any laws that it wanted, regardless of whether or not they were constitutional. The legislative branch could, for example, pass a law that discriminated against a particular group of people, or it could pass a law that took away the rights of individuals.

The judicial branch is essential to a functioning democracy. It ensures that the other two branches of government are held accountable for their actions, and it protects the rights of individuals.