123Movies. "Jangan Pandang Belakang Congkak" tells the story of three youths who each received a letter from the late Pak Sudir inviting them to his house. Upon arrival, they met up with Pak Sudir's helper Mustika and discovered that he was their grandfather and the three of them have the potential to inherit all of his belongings, but under strict circumstances. They would have to stay at his house for three days straight without touching anything, especially an old congkak. On the first night itself, strange things begin to happen.