The Longevity Family: Starting from the Foundation Establishment Ancestor

(A mortal cultivation fanfiction + family-based plot + behind-the-scenes mastermind + feigning weakness to exploit strength + fast-paced, exhilarating story. It doesn't steal the original protagonist's opportunities, but creates a broader path to immortality!)
Is the ancestor going to die?
Han Mu transmigrated into the body of the Foundation Establishment Ancestor of the Han Family of Yanling Fortress. Upon opening his eyes, he faced a desperate situation—his foundation was damaged, his lifespan was about to end, his family was besieged by demonic cultivators, and the three spiritual veins were about to change hands.
In dire straits, the [Eternal Life Family System] is activated.
By binding our bloodlines, our family will never perish, and I will live forever!
From then on, the Han family embarked on a path of rise that no one had anticipated:
In the Yue Kingdom, they were a Foundation Establishment family that had survived by sheer luck; in the Spirit Realm, they were a newly rising human force; in the Immortal Realm, they ruled over a region of immortal territory, standing alongside the Heavenly Court.
Han Mu always remembered the system's first ability—perfectly concealing one's cultivation level, always being one major realm lower than the actual level.
then:
When the Foundation Establishment cultivators of the Demonic Path came to provoke him, he "barely" repelled them, but secretly he had already formed his Core.
When the Nascent Soul stage monster coveted the family's spiritual vein, he "fought hard" to repel the enemy, but in reality, he was transforming into a deity.
When the Demon Lord of the Spirit Realm besieged the city, he "broke through in the heat of battle" and suppressed them with a flick of his wrist.
When the Dao Ancestor of the Immortal Realm laid the trap, he sighed, "I only wanted to be a Foundation Establishment Ancestor and enjoy my old age in peace..."
Until that day, after overcoming countless hardships to enter the Great Luo Realm, Han Li saw the mysterious and low-key Senior Han sitting upright in the chaos, smiling and raising a cup to him:
"Young Han, how about coming to my Immortal Realm of Longevity and becoming an honorary elder?"
—Immortality is not a solitary pursuit; when one person attains enlightenment, the entire clan ascends to immortality.
This is how Han Mu led his entire family, step by step, from a corner of Yanling Fortress to the myriad realms.