But I couldn't see print message because my code is stuck at "Win32::OLE->MessageLoop" to receive event of news title update. How can I execute another code during receiving news update real time?

Don't use MessageLoop, use SpinMessageLoop to make your own verision of MessageLoop

...
Win32::OLE->SpinMessageLoop;
...
Win32::OLE->SpinMessageLoop;
while(1){
    Win32::OLE->SpinMessageLoop;
    sleep 1;
    last if $quitting;
}
...
Win32::OLE->SpinMessageLoop;
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