暗恋是恋爱中的最便宜的
[àn liàn shì liàn ài zhōng de zuì biàn yí de]
'Secret Crush Is the Cheapest in Romance' conveys that harboring hidden affection might be less costly because there isn't any direct interaction between two parties. It reflects on those unconfessed crushes where feelings develop silently, requiring only time and emotion with no need for material investment or engagement unlike a real romantic relationship where mutual responsibilities and resources sharing happen.