黛似故人
[dài sì gù rén]
Literally translated, it means “Darkness Similar to an Old Acquaintance.” In this context, '黛 (dai)', originally describing a dark color like the makeup used in ancient times, conveys melancholy or nostalgic feelings. It hints at someone who evokes memories similar to an old friend, suggesting a mix of warmth and sorrow associated with nostalgia.