Well, watch repair guy opened the whole movement and found the 2 missing screws, he applied glue on the thread and screw both them back.
So now, only noise from the rotor, which is acceptable. Weird thing is, i found my rotor prefers to spin counter clockwise, if i try to spin it the other way, i feels like jerky and dont wanna move that way. Watch repair guy says he is not sure what to do, and blame on quality.. well, i can only smile...