The Return of the Condor Heroes, also called The Giant Eagle and Its Companion, is a wuxia novel by Jin Yong (Louis Cha). It is the second part of the "Condor Trilogy" and was preceded by "The Legend of the Condor Heroes" and followed by "The Heaven Sword and Dragon Saber". It was first serialised between 20 May 1959 and 5 July 1961 in the Hong Kong newspaper "Ming Pao".
Jin Yong wrote The Legend of the Condor Heroes
It is neither because it tells us he wrote the Return of the Condor Heroes and gives no information about the author of the others. The system got it confused because of the similar name