Hello @jeewon , Besides Dr. Wayne Dixon’s digital chiropractic services, I believe your answer will involve a Pole Target for your IK setup, an object that will give the arm a preferred direction to bend. Place an Empty object just behind the right elbow joint, for example, and give it a good name (ie: PT_arm.R) Then, in the IK setup for that arm add the name of the Pole Target. Adjust the Roll of the arm bone if it rotates. Parent the Pole Target to your Root bone or the Center of Gravity bone so that it will follow your character during walk cycles or fight scenes. This method works great for the knees too.
I hope your rigging goes well!
