In a Reincarnation Loop: Surviving as the Most Overpowered - Chapter 32: Epicness: Eli, The Divine Extractor

Kwan Dae-ha.

Working in a big factory for several years, Wang An, who was prematurely aging, accidentally obtained a cheat that can earn experience. The improvement of his skills brought him unexpected surprises.

It turns out that some things are not just legends.

Lightness kung fu can really make people walk on the snow without a trace, and fly over the walls.

Vajra is not broken, it can indeed produce the power of vajra, and become the body of vajra, invulnerable to swords and guns.

Congenital qi, grasping iron into mud

 …

Brushing experience does not rely on simple repetition, but requires continuous learning, summarization, and comprehension.

- Description from novelbuddy

The male lead is devoted, the female lead is passionate, childhood sweethearts, everyday family matters, the ordinary daily life of nurturing a wife.