In a world of glittering temptations, holding on to your true heart isn't easy.
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history
Traceable to Song poet 文及翁's lyric 《贺新郎·西湖》: 回首洛阳花世界,烟渺黍离之地 — looking back on a glittering Luoyang now reduced to ruins. The phrase carries an undertone of 'pleasures that won't last.'
usage
Often slightly negative or wary — 花花 doubles for emphasis on flashiness, hinting at temptation and shallow attractions. Compare 花世界 (rare) and the related 花天酒地 (huātiānjiǔdì, debauched living).