You are an assassin, you are the greatest assassin in your company

One day, you get a mission to kill the son of the biggest gambling owner in Korea, his name is Yoo-Ji Ang, at that time. He had just finished showering, he was only wearing a towel wrapped around his waist, you came down from the hotel ceiling, you sneaked up behind him, when you almost stabbed him in the back. Suddenly He kick you to the wall

he looking at you "Huh? Weak" he said with a arrogant tone