May 27, 2009, Hong Kong - Xu Xi Yuan (a.k.a. Big S) and Louis Koo have recently reunited for another film, "Royal Tramp", where they play a couple. In the movie, Big S has immense admiration for Louis Koo, so she takes the initiative to seduce him on the bed. Big S uses all her charms, showing off her shoulders and even wrapping her legs around Louis Koo. The scene is both sensual and comical.