This film is like a prediction of the future world. With growing people and scarce food and resources, there will be famine or fights for everything.
In the film, the policy-maker introduced a " one child policy" to decrease the number of population, they took the extra siblings out of their houses by force and burned them into ashes. In public, they lied that all these children were just frozen and waiting for the day to come to life. Their plan worked well until seven sisters were found living in secret. These seven girls were named after seven days in a week. Each day, they played their role as Karen and pretended that they were the only child in the house. But one day, Monday didn't go back home after work, so the rest of the girls decided to find out what was going on with Monday. They gathered together and fought bravely with these CBA agents. But sacrifices took place one after another. After a life-or-death fight, Thursday rescued Tuesday with Adrian's help(the former CBA agent). Then they found that it was Monday's plan to sacrifice all her sisters to be the only and unique "Karen" in this world. Hopefully, Thursday defeated Monday and promised to save her twins. In the end , they exposed this fraud and saved all the other children's lives.
Monday has a complicated personality. She is the oldest and most responsible of them all. She protects all her sisters from any harm. But deep down there lies a darkness, she gets bored of taking care of these little trouble-making sisters and pretending to be the "Karen". So she corporates with that evil policy-maker and sets traps for her sisters. Maybe she would regret all her wrong doing when she was dying, but her innocent sisters could not come to life again.
Humanity is complicated, good people sometimes become monsters. The one you rely on may turns against you and stabs you in the back. So never to underestimate the dark sides in humans. Love is the only savior for us all.
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