For the record Tokyo does not have a population of 37.4 million.
Population Of Tokyo 2019 | Population Of 2019
14.1 million (est.)
Now if you are referring to the "metropolitan area" you would be closer to correct.
Population Of Seoul 2019 | Population Of 2019
Conversely, Seoul has a population of 11.5 million.
Seoul's "metropolitan area" population is 25.6 million.
Trump was off by 13 million if we use the same metric you used for Tokyo: "metropolitan area".
If we use the mixed metric like you did referring to city proper Seoul vs. metropolitan area" Tokyo" and reverse it now to your disadvantage, city proper Tokyo vs, "metropolitan Seoul", you were off by 13 million, so you, in refuting Trump, used numbers that were no better than his and you had the luxury of fact checking.
BowlBrother: 37.4 million - 14.1 million = 13.3 million.
Trump: 38 million - 25.6 million = 12.4 million.
Yes, Trump is a blow hard and talks out of his ass, but apparently you do too.