Watch Lang Tong for Free: How to Stream the Movie Online at 123Movies. . Zach (William Lawandi), a remorseless serial womaniser and con man, meets his match in Li Ling (Vivienne Tseng), an alluring and well-to-do woman who makes a wicked bowl of pork rib soup. Things take an unexpected turn when Zach meets Li Ling's younger sister, the drop-dead gorgeous Li Er (Angeline Yap). Soon enough, Zach turns his lecherous attentions towards Li Er, and they begin an affair behind Li Ling's back. Li Er convinces Zach to help her execute a heinous plot to murder her older sister, whom she blames for causing her mother's death. However, things are not as simple as they seem.