In the past life, Sa-ang got her head chopped off by the royals (Kamon, Sothong, Sa-ard, Phutthai). She put a curse on them before getting her head cut off that in the next life, she will have the upper hand. She cursed her dad (Phutthai) to be broken hearted by her constantly, for her mom (Kamon) to prepare her clothing and die from her hands, for her sister (Sa-ard) to get everything taken away from her, and for Sothong to love her and only her in the next lifetime. (Source: asianfuse.net)