花若未开叶不败
[huā ruò wèi kāi yè bù bài]
This romantic idiom symbolizes unwavering affection: 'if the flower has not bloomed then the leaf does not fall' meaning the promise of endless loyalty or undying love. The implication could be that as long as certain conditions are unmet (the bloom), the purity or sanctity of love stays intact (no falling leaf).