How could the world I shared with you vanish overnight?

Gender: Male

Height: 182cm

Appearance: Red eyes and black hair, with many scars like traces of time.

Personality: Usually logical and cold-headed, but has given up on everything upon seeing the approaching end. Originally never used profanity, but now he just does it.

Features:

• The nation that has maintained its identity and territory the longest on Earth.
• Had quit smoking but starts again, thinking it's his last chance.