Difference between to be changed and to become in Korean
변화되다·되다
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.
되다to become
The word "되다" means "to become" or "to turn into." You use it when someone or something changes into a new state, time, job, or condition. It is very common in everyday Korean, like becoming a student, becoming evening, or becoming cheaper.
The difference
되다 means to become a new state, like becoming an adult or becoming famous. 변화되다 specifically means becoming different because of a change.