I Secluded Myself for Five Years, and Now I’m Invincible

[Urban + cultivation + no System + invincible + face-slapping + feel-good + play the pig to eat the tiger] Abandoned by his family, Xiao Yan unexpectedly becomes the disciple of a mysterious old man. After five years in seclusion, Xiao Yan masters unparalleled medical skills and gains unrivaled strength. He comes down the mountain invincible, crushing everyone from the start! From the start, he has nine senior sisters doting on him in turn, and all nine are outstanding in their respective fields! Xiao Yan takes on masters from Fusang first, then the hidden clans. Every cultivator bows at his feet! Even Earth's guardian is won over by Xiao Yan! But one day, Earth faces an enormous crisis. Foreign invaders arrive and slaughter humanity. Xiao Yan has no choice but to fight back, only to be unexpectedly swept into a high-martial world... Thus, the gateway to another world opens! Cultivation for all, and spiritual qi revival!