When I want to do an article, I do "new article" and then I add intro text with default Joomla Editor, and the content, I do it with SP page buider. But at the end, I don't see the intro text. See here, please, for the intro text: https://www.voyage2425.w432.org/index.php/coree-du-sud/seoul then clic on "lire la suite" (means "read more"), you will see the article but not the intro.

How can I do ?

Thanks