As the brand new layout of library launched, some of our fans raised various enquires especially for the limited free. So basically, we have changed the stable modules. Instead, we have made modules flexible and free for providing a individual recommendation mechanism! We have officially answered those enquires. Regarding the limited free module, it may disappear sometimes, but it's not a bug. So when the limited free section came out, please seize the chance to unlock! If you have other questions, please comment below~