The male protagonist Xiao Lizi and his wife Jasmine are pioneers in the dream world, in order to study people's dreams more deeply, they continue to enter the dream, that is, dream in the dream, and constantly enter the next layer of the dream.
Because people's brains run at high speed in dreams, an hour in a dream is only five minutes of the previous dream, that is, 12 times slower than the relative time.
They went deep into the fourth layer of dreams, but forgot the purpose of their coming, they built their own world in the dream, and lived in the fourth layer of dreams for about 50 years, until they died in the fourth layer of dreams, they woke up, because the reality of 5 minutes is equal to 1 hour in the dream, the more dreamy, the greater the time difference, so in reality they actually only slept for one day.
Because they use sedatives, they will not wake up no matter what layer of dream they die in, but will enter the lost realm, after which their memories will be affected and they cannot remember how to go back.
Xiao Lizi used his wife's totem top to prove that this is not reality, so he implanted a "doubt everything" idea into his wife, successfully persuaded his wife to commit suicide, and returned to reality together.
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Since they are injected with tranquilizers before going to bed, if they sleep for 20 hours, the time of the fourth layer of dreams is: 20×12× 12×12× 12 = 414720 hours, that is, 47 years.
The old soul returned to the young body, Xiao Lizi found that there was something wrong with her wife Jasmine, Jasmine began to doubt the world, she felt that this real world was not real, it was also in the dream, she must wake up and return to her so-called "real world", so she forced Xiao Lizi to commit suicide with her and return to the real world that belonged to them.
So, Jasmine came up with a plan, on their wedding anniversary, she left a suicide note, writing that her husband Xiao Lizi has been threatening her life, so that she has no way out but to commit suicide, and found 3 psychologists to prove that she is not mentally ill, she wants to force Xiao Lizi to commit suicide with her. In the end, Xiao Lizi did not jump with her, Xiao Lizi harbored deep self-blame, and because of that suicide note, he was accused by the US police, and had to flee overseas.
Little Plum, who has fled abroad, and his good friend Arthur make a living by taking on private work, and on this day he is commissioned by Cobo to sneak into the dream of Japan's rich man Saito to steal important information. However, the plan is sabotaged by Little Plum's subconscious wife, Jasmine, and Little Plum has to kill his good friend Arthur (causing Arthur to wake up in the dream) and then leave the dream in a hurry.
They returned to the previous layer of the dream, when The Little Plum took the gun to force the Japanese rich man Saito to tell the secret, and punched Saito on the carpet, but Saito just found a flaw in the dream that the Little Plum had constructed, he found that the carpet was polyester rather than wool, so Saito found himself still dreaming, in the dream, so that the little plum team's dreaming operation failed completely.
They all woke up and went back to the real world—on a high-speed train in Tokyo, Japan. Xiao Lizi gave his team a reward, then announced that the plan had failed, and each of them evaded the pursuit of the hiring company, Cobo.
At night, Xiao Lizi picked up the pistol and stared at his gyroscope (this gyro was left to him by her wife Jasmine to distinguish between reality and dreams, if the gyroscope has been rotating abnormally, it means that he is in a dream, if he slowly stops, it means that he is in reality), he uses the gyro to distinguish between dream and reality, if it is in a dream, Xiao Lizi will not hesitate to commit suicide to wake up, he does not want to be lost in the dream as he was.
At this time, he received his son and daughter who were far away in the United States, and they asked Xiao Lizi when he would see his father again, and Xiao Lizi very much wanted to return to China, but because of the "murder", he could not go back.