Spring and Autumn Lock

There is a saying that has always been circulated in the streets of Chang'an - "If there is any thorny matter that cannot be solved, go to the person at Yuge Tower and ask for a lock. As long as you unlock the lock, that person can solve all your worries." Until one day when Wan Huan went to get the bird cage, she accidentally heard this sentence. She couldn't help but widened her eyes and said to Wan Sheng beside her: "If you have something difficult to do, don't you report it to the official and come to our Yuge Tower? How can you relieve all kinds of worries?? This??" Wansheng nodded silently: "Every day, many people come to beg our wife... And the wife always disappears..." Wan Huan was confused in the wind: "... So... What Madam said about having something to do is just an excuse. Is it because of this that she is absent during the busiest times?" Wansheng looked at her silently: "At the busiest time... I really have nothing to do..." Wan Huan: "???"