I've been told I need a bone graft. Are there any places in Bupyeong, Incheon that offer dental implants?

I went to the dentist, and they told me I don't have enough bone and need a bone graft to get implants.
When I look for a hospital, the thing I check the most is whether the doctor is a specialist, lol.
I heard that the head director of Plan Dental Clinic is a board-certified oral and maxillofacial surgeon. If anyone has experience with bone grafting, I am curious to know what your experience was like.
I would also like to know if it hurts and how long the recovery period takes.