First, Thank for you are concerned about my question. I need your help. You are of great help to me. I made model same obj. And, this time, I change the parent. And I made it same way. You say, "the lower left leg appears to break apart from the upper leg because there are two parents for the same child " This time, parent is one. But, I can not. How can I fix it? You can see my image in http://www.visionmode.co.kr/001/born/004.html And You can download my file http://www.visionmode.co.kr/001/born/Runtime-02.zip