好景不长

wǒ lè hē hē de zhí xíng le tā de zhǐ shì kě hǎo jǐng bù cháng jǐn jǐn guò le jǐ miǎo zhōng wǒ yòu děi qù kāi mén

我乐呵呵地执行了她的指示。可好景不长，仅仅过了几秒钟，我又得去开门。

I obeyed her with pleasure, but good times don't last long. I had to open my door again in seconds.