What is the meaning of the smile gradually disappearing?

The meaning of the smile gradually disappearing:

The meaning of this meme is that someone who was originally very happy suddenly becomes unhappy due to a sudden blow. It is also often used as "the smile gradually disappears" or "the smile gradually disappears". But in fact, this sentence pattern has been popular for a long time. In the "See which celebrity you are similar to" software, the original intention is to see which celebrity's face is most similar to our own. Unexpectedly, some good netizens tested it with various expressions, and the results appeared. A lot of funny stuff.

The origin of the word "smile gradually disappears":

The word became popular as an Internet slang around April 2017. It became popular on the Internet because of its magical "smile gradually disappears" Emoticon pack

After the word became popular, many related usages were derived. Common ones include "the smile gradually becomes wicked", "the smile gradually becomes abnormal", "the smile gradually solidifies", "the smile gradually becomes rampant", "Smile gradually comes to society", "Smile gradually appears to society...and other words

Usage examples:

Used when a sudden shock comes when you are very happy, for example: when When the test results come out