Zygomatic bone surgery requires surgery. There will be anesthetic during the operation, so it won't hurt, but it will definitely hurt after anesthesia. As for how intense the pain is, it varies from person to person. Some people are more tolerant and not afraid. If you are afraid, don't go. What suffers is bandages and hoods, which are swollen and painful.
But the first day is definitely serious, so it's better to take your time. Therefore, I suggest you go to Korea for plastic surgery, which is advanced in technology and effective.
Moreover, there will be a therapeutic instrument to help reduce swelling and suffer less.