The climax of this film begins after the death of the heroine "this world", and the in-depth analysis may be a little confusing. If you interpret it according to the concepts and inertial thinking expressed in the film, you will encounter some bugs. For example, why is the female protagonist that the male protagonist sees using a machine an "omniscient perspective" for the male protagonist? This does not correspond to the objective facts about the afterlife mentioned in the preceding and following paragraphs.
Here is an idea. In the dying state, what people reach through the machine is only the subconscious, which is like returning to the light, in order to make up for the regrets of this life. At this time, everything was constructed by his subconscious like a dream, so the heroine who the male protagonist met through the machine said: She is part of the male protagonist's memory.
And only true death can lead to the true afterlife. Here, memories from previous lives cannot be directly inherited. But it will leave an indescribable impression on the subconscious. Therefore, the male protagonist will subconsciously take the seasickness medicine, go to the beach subconsciously, and subconsciously feel familiar with someone and something. This is the accumulation of deep impressions from previous lives. It was not until the male protagonist entered the machine in a certain life and saw the female protagonist in his subconscious that he awakened the memories of previous lives.
At this time, the male protagonist was really dead because he failed to wake up from the machine in time, so he arrived in a new afterlife. Since he finally succeeded in saving the heroine who jumped into the sea in "this world" and learned the knot of the heroine's heart, he subconsciously decided not to save the heroine's suicide, but to save her son and solve the problem. Open her heart knot for the purpose of starting the journey of the next life.
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