I haven't read this specific story, so I can't summarize it directly. But generally, it might be about a king and a singing bird that have some sort of encounter, perhaps the bird's song has an impact on the king, like changing his mood or making him realize something important.
In 'the king and the singing bird short story', it could be that the king discovers the singing bird. The bird's song might be so beautiful that it attracts the king's attention. As the story progresses, the king may face a decision regarding the bird, like whether to keep it in the palace or let it be free.
The king and the singing bird are the main characters. The king represents power and authority, while the singing bird represents something more free - spirited, perhaps beauty or nature. There might be other minor characters, but the focus is on these two.
One possible moral could be about the value of freedom. The singing bird represents freedom and its song is a symbol of the beauty that comes with it. The king, who may have a lot of power but perhaps lacks the freedom of spirit, could learn from the bird that freedom is precious.
The main plot is usually about a king and a singing bird. Maybe the singing bird has some special abilities or qualities that interact with the king in various ways, like bringing joy to the king's dull life or teaching him important lessons through its songs.