<p>One of the key moments from Lee Chang-dong&#8217;s last film, 2018&#8217;s &#8220;Burning,&#8221; still glows bright in the memory. A girl mimes eating a tangerine, and explains the knack for making it convincing: don&#8217;t try to pretend there is a tangerine, try to forget there is not. It&#8217;</p>