She was sold into the palace at the age of eight. A piece of red cloth was her last thought. She and Azhi depended on each other for life, from supporting each other in the broken car to counterattacking in the palace. However, under the calculations of the imperial power, the former sisters gradually drifted apart due to their status as beloved concubines. One became obsessed with power, while the other struggled to stick to her original intention. The emperor's preference hides the truth about the substitute, and the palace walls are full of betrayal and sacrifice. When blood stained the palace, she finally escaped from prison with Azhi's sister. This deep palace robbery in the name of love hides the most painful sisterly love and the coldest emperor's heart.