One Piece - I Am A Different Luffy! - Chapter 476 - 474 - The Wano War 14.

After Reincarnating into Naruto World at the Warring State Era as an Uzumaki, Masahiko thought that he got a useless System. He lived for 48 years as a normal, below average Uzumaki Shinobi.

That changed when he finally knew how the system works the day of his 49th Birthday!

- Description from Novelupdates

Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.

I had a supporting role in a modern fantasy.

The loyal dog of a villain with an angel’s name, Cheon Sa-yeon, and an unfortunate supporting character who died on his behalf, Han Yi-gyeol.

In order to escape from Cheon Sa-yeon and survive, he must use the protagonist, Ha Tae-heon.

But Ha Tae-heon, who he thought of as a lifeline, was infinitely indifferent to him. Rather, Cheon Sa-yeon showed interest.

But besides that, something strange happened.

The events that occurred in the original story had advanced, and the gate and monster levels had risen. Even the people were “different” from the original.

The original version I was trying to use was wrong.

Married for four years, there was no love in the life of Su Ran and Song Ting Yu. They were forced to marry because of Su Ran’s pregnancy. Ting Yu thought Su Ran was a foxy woman that tricked him with a purpose to enter the Song household, that’s why after the night after they both said the wedding vow, he immediately went overseas to be with his love and never came back even once​ to see his son.

Four years later, Song Wei Xi, the son of Su Ran and Song Ting Yu, was diagnosed with a rare illness. Madame Song, Ting Yu’s grandmother, knew this situation was urgent and asked Song Ting Yu to come home to help with this situation. Song Ting Yu couldn’t help but come back home, he came back to face his forgotten wife and child. Su Ran promised Ting Yu that she will sign the divorce paper if he agreed​ to help. Will Song Ting Yu agree with this proposal? Will he still leave after the recovery of Song We Xi or will he stay? Will love start to grow in their family?

- Description from Novelupdates