An excuse, this is clearly just an excuse.
Even though it can be considered a duty to accompany Mu Lin, the main reason is that, because they didn't know Jing Chen's identity during the last time and couldn't see clearly in the dead of night, they had to come out and take a good look when they heard today that Jing Chen came to pick up Mu Lin. They owed it to their own eyes.
It wasn't until yesterday when they overheard the conversation between Jing Youlan and Mu Lin, that they came to know that Mu Lin had to go out every week mainly to attend to Jing family's old man, she truly lived up to her name, Mu Lin.
That means that Mu Lin is indeed backed by the old man of the Jing family!
No wonder she knew Jing Chen.
Hearing Ye Xiwen's words, Yang Yuebin snorted coldly and quickly jumped off the bar, his face unusually flushed, as if he had been upset by Ye Xiwen.