A movie about ...?????
STORY - aliens want to invade Earth. The last point of invasion is Shanghai. The last hope is a super canon. And that is it.

ACTING - not stellar, but ok.

MUSIC - I do not appreciate this kind of OST. Nothing add to the movie.

REWATCH - no. The weapons, the defense mechanisms and so on don't make any sense. The Special effects and CGI are sometimes good,but also bad in other moments..

OVERALL - a romantic movie without romance, could be much much much better. I do not advise watching this.