Armor: Bind the Armor Development System After Time Travel

[Armor 1+Armor 2+Armor 3+Unknown] (excluding all villains and heroes) There will be other characters in the future who are not included in the three armors Although there is a system to travel through the armor, why are the people in this world so defiant? Do I really deserve to fight in their battles? Warm reminder: Magically modified text~