后悔药多少钱一瓶
[hòu huĭ yào duō shăo qián yī píng]
'后悔药多少钱一瓶' translates as 'How much would a bottle of regret pill cost?' A playful take on being regretful. People sometimes joke about wishing they had a magic remedy for their past mistakes or wrong decisions, hence the 'regret medicine'.