There is a bookstore with an elegant environment near Longcheng University. The owners of the bookstore are a pair of brothers. One of them has a cold personality and the other is warm and hospitable. They coordinate with each other like ice and fire.
It is rumored that there are two passages between the Earth Star and the Sea Star. One passage is controlled by the black-robed envoy and the regent, while the other is guarded by a pair of twin carvers. According to legend, when the two of them appeared, one wore a silver mask with blue stripes and the other wore a silver mask with red stripes. Even the black-robed envoy had never seen their true faces. The one with blue stripes was cold and strict, and the one with red stripes was hot on the outside and cold on the inside. Anyone they find trying to cross the border will be killed without mercy, even if the black-robed envoy intercedes, it is useless.