Assassination Game, This Assassin Can Go Back

My name is An Xin, an assassin. I was on a very difficult mission at this time. I am going to kill a cruel and tyrannical king in a heavily guarded palace. I came here so that no one would find out... Then we can only keep no one! After all, I am a senior assassin, so it is natural for me to be cautious, so there is no need for you to make a fuss! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.