Susan's Lunch | Walkthrough Sleeping Dogs Guide

When you end the mission, a woman needed help will be marked on your map. Yellow mission increases face what allows you to buy better cars and clothes. Take money from the shop assistant and get it to the pointed restaurant.

Just before entering the building, you'll be attacked by the group of thugs. Defeat them, using the nearby objects, to load the face bar in the left bottom corner. As you will notice, thanks to that you regenerate some health and enemies will be less aggressive. The bar goes empty after every received hit.