How Did He End Up Cultivating Immortality?

[System-focused] Young Jiang Nan's soul transmigrates into another world and ends up in the body of an idiot. He's as good as dead from the start, but fortunately, transmigration always comes with a golden finger. He avenges the original owner and sets off on the path to immortality. Along the way, he meets all kinds of people... A friendly, outgoing swordsman whose sword chill spans fourteen provinces; a Buddhist cultivator of joyful meditation who vows to betray neither the Buddha nor his beloved; a proper and courteous Confucian disciple; and a diviner whose hexagrams are downright cursed, with the good ones never coming true and the bad ones always coming true... And, of course, he meets beautiful women... A gentle, caring older sister who has suffered heartbreak, a boisterous young martial cultivator who loves dancing around with her weapons, a beguiling female cultivator from the Hehuan Sect, a soft-spoken and sweet-tempered young alchemy cultivator, and a female spell cultivator who was born without the ability to feel emotions...