Could homefront the video game happen in real life

Yes, it could. Because North Korea have admitted to be holding a Nuclear Missile aiming directly at South Korea's capital city Seoul. So, if North Korea fire the missile Australia and USA would retaliate at North Korea. Then, North Korea will contact their allies 'Russia, China' causing occupation in South Korea and this will lead to the result of America contacting the UK and the UK will attempt to bring their allies 'France, Germany, Italy, Liechenstien, Canada, Ireland, New Zealand, Japan, Belgium, Netherlands, Poland, Norway and Pakistan to assist them in defending South Korea causing WWIII