Difference between to grow and to become in Korean
성장하다·되다
성장하다to grow
성장하다 means "to grow." You use it when a person, plant, animal, or even a business becomes bigger or develops over time. It is often used for healthy growth or steady progress.
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 changing into a new state, job, or thing. 성장하다 means developing over time, not simply becoming something else.