Immortality! Immortality! Talk About Longevity!

[No system]-[Invincible background]-[Huge world] [Light humor]-[Decisive killing]-[Complex system] [No heroine]-[Protagonist is witty]-[Supporting character is three-dimensional] Two people with completely opposite personalities If one person wants to return to the top, a third party will inevitably intervene to succeed! Living silently, looking for the meaning of eternal life! Magnificent world view and all kinds of characters! Everyone has his or her own life trajectory. A few knives... A few people... A lifetime... Just a lifetime...