More information: http://wp.me/p1SfP0-Xy
In this mission you have to eliminate the King of Chinatown. This mission is fairly short if you ignore challenges. This guide is just to completing The King of Chinatown mission on the hardest difficulty (purest) without being seen. This guide does not explain how to complete the different challenges.
At the start go all the way to the back of the little area and pick up a bottle.
Throw the bottle onto the edge of the open sewers.
The police officer will walk up to the sewers after a little while. Wait until the chef to the left has turned around, then walk up to the police officer and push him into the sewers.
Towards the back of this shop area is a table and a menu card. Walk up to the menu card and start looking at it.
After a while the King of Chinatown will walk up next to you and eat a bit of the food there. Then he will turn around and also stand in front of the open sewers. Walk up to him and kick him into the sewers.
This actually counts as a signature kill. You have now completed the objective and can leave the area. The exit is towards the back of the alley the food shop is on.
This is the end of the mission, You should get around 80 000 score if you complete the mission exactly as I have.