Why Did I Become an Immortal?

Lin Feng accidentally joined a communication group composed of cultivating fairies. Every member of the group was as beautiful as a fairy. What they talked about all day long was practicing, fighting monsters, and entering secret realms. Lin Feng thought they were playing online games, until one day his physical fitness improved by leaps and bounds, and he finally discovered that these were cultivators, real fairies, and Lin Feng also began his journey of cultivating immortals.