Don't agonize over the characters in a historical drama — the ending was settled long ago.
Tips
usage
Almost always used as advice not to worry: 别 / 不必 / 何必替古人耽忧. Closest English match: 'crying over spilt milk' or 'fretting over things you can't change.'
memory
Read literally: 替 on behalf of + 古人 ancient people + 耽忧 worry. You're losing sleep over folks who died centuries ago — pointless.
