Wang Xiuya and Lu Jingqiu met and affectionately referred to each other as sisters.
Wang Xiuya was a year older than Lu Jingqiu, so she called her Sister Qiu. She asked Lu Jingqiu to call her Sister Xiuya.
Technically, she was the matchmaking candidate Mrs. Shen had picked for Jiang Nanzhou, and by normal standards, they should have been rivals, each employing all sorts of schemes and facing the scorn of a mother-in-law. But in reality, since her arrival, Mrs. Shen never even mentioned Wang Xiuya and seemed quite satisfied with her; Wang Xiuya herself had no such intentions and actually liked her quite a bit.
The key point was that she knew Wang Xiuya would eventually end up with Shen Mu, and now she was asking her to call her sister. That future image... would be quite peculiar.
However, all that was in the future. For now, the four of them took the tram, traveled a few stops, and arrived directly at West Street.