Difference between to be changed and to change in Korean
변화되다·바꾸다

변화되다to be changed
(변화되다) means that something is changed and becomes different from before. You can use it for places, plans, schedules, or even someone's ideas. It often talks about the result after a change happens.

바꾸다to change
바꾸다 means to change one thing into another, like changing clothes, plans, or your seat. You can also use it when you exchange something, such as money or a shirt at a store. It is a common everyday action word.
The difference
바꾸다 means someone changes something on purpose, like a plan or clothes. 변화되다 means something has been changed, often focusing on the result, not the person doing it.