The Immortal King Chooses Not to Choose

I was originally an otaku who was just waiting to die, but accidentally traveled through the world of immortality. Although the story is cliche, I still tried to cultivate immortality, but I didn't want to accidentally get involved in a space black hole. Unexpectedly, I entered a secret realm with countless inheritances and various arts of cultivating immortals. After staying alone for five million years, I have mastered all of them. Finally became the Immortal King. Although his lifespan is unlimited, life is difficult. After finally breaking through the secret realm and coming out, I felt numb and didn't know what to do, so I opened a grocery store in a lower realm to kill time.