Be Invincible Starting from Kai Dad

In 3778, aliens invaded and Blue Star fell. People discovered that heroes could be summoned from the game. Since then, humans and aliens have been engaged in a century-long struggle. Heroes emerge in troubled times, and everyone is a hero. Heroes, heroes, and people's hearts. Who can protect themselves in the apocalypse? The introduction of Speechless must be more than 100 words. I am crying. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.