Pre-Login to Game, Marriage Alliance with Empress

Player Xia Chen enters a survival game and discovers the timeline is five years ahead of the setting, becoming the fiancé of an Empress who died early. While improving himself to complete tasks, he uses known information to strategize, rising from a useless person to a rival capable of challenging the Empress. Upon discovering this is a parallel universe through exploring new gameplay mechanics, he eventually ascends the throne with the Empress to become dual emperors.