In the end, Blue River didn't join Guild Happy. In the novel, he rejected Ye Xiu's invitation and stated that he was a member of Blue Brook Guild. Even though Blue River had once infiltrated Guild Happy with the identity of "Gorgeous", he had been seen through by Ye Xiu and had become a consultant for Guild Happy. He hadn't officially joined Guild Happy. While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!