Even though, when the Immortal Realm had not yet been divided into the Lower, Middle, and Upper Realms, the Immortal Realm Territory where Shen Feng resided was relatively backward, the techniques he created for Refining Medicine and Artifact Refining far surpassed those of the other territories of the Immortal Realm.
As a result, after the Immortal Realm was divided into the Three Realms, not only the Lower Realm but even the Middle Realm were using the techniques for Refining Medicine and Artifact Refining created by Shen Feng. Thus, nearly everyone in the Middle Realm knew of the legendary figure, the Carefree Immortal Emperor.
Chen Feiwen, Wu Gang, and Zhang Kaiding embarked on the path of Alchemists, and they too had learned about the Carefree Immortal Emperor from ancient texts. It could be said that the Carefree Immortal Emperor was an idol in their hearts.