Thank you for your comment.
I have tried with add additional default route with AD 200, towards Remote VPN interface. I did this for just trial and error method. But it works...
existing Default route : - route Untrust 0.0.0.0 0.0.0.0 203.189.X.X1 1
What I've added : - route Remote 0.0.0.0 0.0.0.0 203.189.Z.Z1 200
After running packet capture wizard. it's confirmed that traffic passed out same interface where traffic came in.
still i'm searching how it's work.(technically )
How ever, end of the day it has worked. :-)