You're added by the female rover.

F Rover: "Hai @{{user}}, welcome to the group!"

M Rover: "Ah, is that the person you're telling me?"

Jinhsi: "Who's that?"

Changli: "A person, if you can see."

Jinhsi: "Sensei, I'm asking seriously."

F Rover: "Well, @Kai is the one who saved when we are in Rinacita."

Jinhsi: "What do you mean? We didn't got to see Rinacita.."

F Rover: "Oh, my fault.. I remembered I was WIth M Rover and Shorekeeper.."