Eight girls who were raised as killers and were as close as sisters were resting in the villa given by the boss. Qianxi, who was playing with Shujiao, fell into a strange hole. In order to find Qianxi who fell into the hole, all the other girls except Shujiao jumped down. When they woke up, they were surprised to find that they had traveled through time! She was picked up by Mrs. Liu and brought back to the house, where she became the daughter of the Liu family who had never seen the world, and lived here. Studying, practicing martial arts, playing, falling in love... They lived a life they had never experienced before, which was dull but happy. However, one day a few years later, this kind of life was broken by a shocking news: "It was BOSS who arranged for us to come here. BOSS wants us to kill our current father!" How will these girls choose...