I recommend Yonsei Good Neurosurgery in Siksa-dong.

The groom complained of a headache, couldn't sleep, and his shoulder hurt like frozen shoulder, so he couldn't move properly.

I went to a nearby orthopedic clinic in a hurry, but it wasn't effective and they weren't very friendly. So, a friend recommended me to Yonsei Good Neurosurgery Clinic. They were very helpful and gave me thorough explanations. It's not a dramatic improvement, but I'm getting better little by little.