Greg might have smiled because he saw a loved one, received good news, or simply because he found inner peace and contentment at that moment.
Maybe something good happened that made him happy and that's why he smiled.
Maybe he's happy because something good happened to him. Or it could be that he finally achieved a goal he was working towards.
Else might smile at the end because of a hidden surprise or a realization that made her feel good. Maybe a long-awaited event happened, or she overcame a big challenge.
The reason why Crown Prince Qing Yuannian laughed after being grounded for three days was because he had successfully achieved his goal. He had deliberately prepared this plan and achieved the results he wanted during the three days of being grounded. The Crown Prince's smile was both a praise for his own intelligence and a mockery for others who had been deceived. The specific reason for the smile was not explicitly mentioned in the search results provided, but it could be speculated that the prince's scary smile was because he had successfully achieved his goal, and his smile carried a sense of evil and complacency.
Well, one reason could be that fans saw a hidden depth or untold stories in Greg and Marcia that they wanted to bring to life through fanfic. Also, their popularity in the source material made them prime candidates for fan-created adventures and romances.
Maybe the author had a specific vision or plot arc in mind and felt that was the natural conclusion.
Maybe it was time to bring a closure to the story and give it a fitting ending. The creators might have felt they'd told all they wanted to tell.
It could be that the author had a planned ending in mind from the start or ran out of creative ideas. Also, sometimes external factors like low viewership or publishing decisions can lead to a story ending.
It ended that way to provide a satisfying conclusion and wrap up the story arcs of the characters.
It could be a bug in the game's programming. Maybe there was an error in the code related to the final part of the Typhon encounter.
Well, the ending of Marriage Story could be due to a combination of factors. Maybe it was to show the complexity and ambiguity of relationships or to give viewers space for their own interpretations.