These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Though, to be fair, the only person we actually see burning in the entire movie is Luka. Way before the end.
Tear Jerker: Toshi's death and many moments after the nine-year timeskip, including Kei's prison scene where he calmly asks to be thrown into the sunlight, Sho's "death" at the hands of Son, Yi-che's inability to recognise that her husband was not Kei but Sho after she got the tumor, Sho begging Kei to come save him because he had no idea what to do anymore, and several more. God damn, I cry every time I watch this movie.