Mona, are there any stragglers in the legendary mission?

Mona, it is said that there are stragglers in the mission. According to the relevant public information, players can start the game, complete some tasks in advance, find Mona, and then complete the dialogue with Mona, which can trigger the story of stragglers. Mona said there were stragglers on the mission. I missed this trigger moment and can only wait for the follow-up story.