The reason why the plot is similar is because this movie is based on ancient Greek mythology, and JK Rowling has also tried it, and the "Harry Potter" series also quoted some elements of ancient Greek mythology, such as the first one. The "three-headed dog" in the ministry is the guardian of hell.
In fact, this relationship will not affect the performance of the film itself. This may be because I myself like ancient Greek mythology, and there is also a book "Ancient Greek Mythology" on my desk. I have always felt that the myths of ancient Greece are not only mythical, but also full of romance, that the gods have "human nature". It is precisely because of these human natures that God has a story, instead of giving people a feeling of being aloof and extremely cold.
I believe that many people will definitely look for "Ancient Greek Mythology" to read after watching this movie, because only in this way will they know who "Charon" is and who is the ferryman from the underworld. In this way, when I watch the second part in the future, it will be more real, rather than just watching a lively event.
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