One Piece: God of Space - Chapter 6 Demon Sword Muramasa

Amidst a world plunged into chaos, where rituals have collapsed and music has spoiled, and the universe is muddled, Gu Qingfeng finds himself transported to this tumultuous era.Initially, he only desired to live out his remaining years in peace. However, the birth of his first son made him realize that things were not as simple as he had imagined...

Go back to 2000.

Lin Feng didn’t want to disturb the situation, he just wanted to protect the things he cherished.

However, there is no need to explain the open life.

Since it’s all over again, there’s no turning back when you open the bow!

- Description from novelbuddy

He died on the wedding of the girl he had a crush on, after a long and successful career. After convincing Yama to send him back to the world, he decides to fix the areas in which his life went wrong. Realizing the lack of love and romance in his past life, he sets out to conquer the hearts of various women.

An orphaned boy with dreams of making it big through being a blacksmith is given a once in a lifetime chance to succeed when he's taken in by an odd pair - Eggor and Ella. While former teaches him the arts of craft, the latter teaches him the mysticism of cultivation, granting him two paths to tread in this life.