What does it mean to sign five Yangcheng against the current?

Accept related tasks or meet certain conditions. According to the query, Jiuyou.com shows that Wuyangcheng is a key point in the plot of the game "Sailing Against the Current", and signature means that players participate in the plot by signing in the game, indicating that they accept related tasks or meet certain conditions. Sailing against the current is a computer client game with martial arts theme developed by Hangzhou Netease Lei Huo Technology Co., Ltd., which belongs to a large-scale multiplayer online role-playing game.