The film also criticized the Korean mathematician, which is also very utilitarian, because this mathematician proved the Riemann hypothesis (because it has not been proved yet, it was put forward in the film, and later generations have to test his proof). And "Riemann hypothesis is related to cryptography, not only military encryption, but also e-commerce, online banking and shopping, which will be completely cracked." Therefore, after "losing" him (Li), he left his seriously ill wife and took his son to the north, hoping to get a good scientific research environment and a free future for their children. But unexpectedly, my son couldn't adapt and insisted on swimming back to North Korea. The result was killed by south Korean soldiers. So Li chose to "disappear" and become a university security guard) and "catch" him (let him return to the control of the government and serve the army). There may be such a "big contradiction" because it makes the story more hierarchical, but it is also a cliche.
Unfortunately, the film's most direct approach to mathematics is to introduce the beauty of Euler formula through Li, trying to let the audience understand the beauty of mathematics. Unfortunately, this bridge was used in the Japanese "Doctor's Love Equation" before.