"Young Master, when the Mainframe Areas upgraded, it takes 3 hours to initialize, and when it complete its initialization, you are already sleeping, and we know that you are so exhausted that night so we make the notification sound disabled so you will not be disturbed. We also put the settings of the notification function to be mute everytime you are sleeping, so from now on Young Master, you need to check your notification list every morning." Bleiz explained.
