Ultimate Level 1 - Chapter 43: Threat to all

(Naruto + Single Heroine Tsunade + Romance + Action)A failed author transmigrates into the Naruto world, becoming the younger brother of Konoha’s White Fang, Sakumo Hatake, and the uncle of Kakashi. He gains a cheat ability—enhanced cellular activity.Coincidentally, just before the Second Shinobi War, he participates in a Jonin meeting where he supports Tsunade's proposal ahead of Dan Kato, marking his first encounter with her.From then on, he launches an intense pursuit, winning her heart during the war.Tsunade: “Kawakaze, why do I keep losing to you?”Kawakaze Hatake: “Because I’d like to live a few more years...”Kakashi: “My uncle is amazing, I’m his biggest fan!”Kawakaze Hatake: “Keep it low-key, keep it low-key.”

Lan Chang’an has gone through two lifetimes of reincarnations, and in the third life, he aimed for stability until reaching the Nascent Soul Realm in hopes of unraveling the mysteries of the Nine Seal Stele. Consequently, he cultivated the Ancient Trees Evergreen Technique, which wielded modest power in return for greater lifespan.

His approach is not one of fearlessly engaging in battles, but of navigating with steady precision and forging meaningful bonds with others.

Throughout his long cultivation journey, he encountered individuals at various stages of their cultivation, including a Decent Faction Head, a Prodigious Beauty, a Giant Demon Lord, an Evil Cultivator, a Thousand-Year Old Demon, and a Puppet Master Pulling Strings From Behind The Scene.

Observing the ebb and flow of the world, witnessing its ups and downs, he unknowingly became a living fossil in the realm of cultivation, akin to an evergreen tree spanning through eternity.

In the world of mortals, the flow of life is steady, shrouded in the illusion of longevity, yet decisions are made decisively, with a clear sense of morality.

Collapsed without warning, and upon awakening, he found himself back in his childhood.He thought it was a blessing from above, but unexpectedly, tumultuous changes ensued, shrouded in mystery...

A supreme expert in the Immortal World had died, and a strand of his soul returned to its original body on Earth. Tang Xiu discovered with amazement that ten thousand years passed in the Immortal World, yet only a single year passed on Earth.

Ruthlessly betrayed by his lover and trusted friends, Tang Xiu found that his soul went back to his previous body on Earth, and, despite he spent 10,000 years in the Immortal World, just a year has passed on Earth and many things have changed. Having an unsurpassed knowledge, Tang Xiu will protect his loved ones and go back to the Immortal World to take his revenge.

- Description from Novelupdates