Nathan, an orphan in a world teeming with magic and beast creatures, navigates a survival landscape where strength preyed upon the weak. Being adopted by an assassin from the Crimson Serpent organization, Nathan grew up and found himself training to be an assassin within its secretive ranks.

Executing missions flawlessly, Nathan gained favor among higher-ups. However, a fateful mission to eliminate a noble took an unexpected turn—false information he received led him into a trap. Outnumbered and betrayed, Nathan faced a brutal defeat, cast into a river to meet his end.

Just as he was drowning and succumbing to his injuries, a miraculous event occurred. A golden light enveloped him, healing his wounds with an extraordinary speed. The water around him became isolated. 

Perplexed, he wondered what was going on.'What is happening? Who has saved me?' Thoughts ran up in his mind.

Suddenly, a prompt and a golden holographic screen appeared in front of him.

[Ding!]

[Congratulations to the host for binding to My Assassination System. With the system, the host will be enabled to be a supreme being that causes terror to everyone's hearts the moment that they hear your name.]

[Through missions granted by the system, the host should be able to become the most formidable assassin in the world, with an organization that strikes fear in the hearts of every evildoer.]

[Congratulations to the host for completing his first mission. Reward is granted: You are rewarded with a level up pill.]

[Congratulations to the host for managing to become the top assassin in his region. You are rewarded with shadow leap skill.]

And just like that, Nathan's life changed completely.