The director wants to express the core idea of the whole play: whether the stars I see are very close to each other in the prime of life, or stars that have long since ceased to exist hundreds of millions of light-years away but continue to transmit light and shadow at the speed of light, all of them are. You can continue to accompany stargazers in the future, even if the latter is just a light and shadow, but in the eyes of stargazers, it still exists as real.
After the male protagonist's death, he has been carefully designing various tokens, DVDs, gifts, etc. and letting the female protagonist receive them at the right time, so that the female protagonist can feel that even the deceased male protagonist can still be like billions of lights. The stars that have vanished outside the year continue to convey messages to the heroine. At the same time, the male protagonist has been emphasizing the multi-dimensional universe, emphasizing that there are 11 us scattered in infinite universes, so at this time, the female protagonist feels as if the male protagonist from a parallel universe has been in contact with herself.
The director probably also wants the audience to know that even the heroine of a doctor of astronomy will be confused by the carefully designed emotional transmission after her death, thus bringing the illusion of an unproven parallel time and space to the heroine, which fully illustrates this passage. Love is hard, deep, and never fruitful.
Therefore, it is not easy to maximize this kind of love, and astronomy is an essential element of this drama.
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