shōu dào hóng bāo hòu, kě yǐ gǎn xiè zhù fú, bù yào dāng chǎng wèn lǐ miàn duō shǎo qián

收到红包后，可以感谢祝福，不要当场问“里面多少钱”。

When you receive a red envelope, you can express thanks and blessings, but don't ask 'how much money is inside' on the spot.