Global Reincarnation: Only I Know the Plot - Chapter 12:

What will you do when the gods turn Earth into their playground? Run, hide, and hope for the best? What if it isn’t an option? What if you’re the thing they want to play with? What if they want you to play for their entertainment?That is what the humans had to go through when the gods forced an awakening upon them. Pick classes, slay monsters, and survive being the god’s pet. Surviving an apocalypse can be fun, but a divine apocalypse? It will be fun… but only for the gods. For the rest, it is a test for survival.Maybe not for everyone. What if someone views it as an opportunity to take revenge on everyone who had betrayed him? What if someone doesn’t care about being used by the gods as long as he can use them for his revenge?That’s what Kang YuWon sets out to achieve once calamity strikes. Revenge on everyone, including his family, and even the gods, if they ever cross paths.

Tong Yao never expected that getting a milk tea could result in getting struck by lightning on a sunny day, and then waking up in the 1980s. She became a mischievous, spoilt wife of a top-tier doctor from the future. Rather than leading an ordinary life, she was caught eloping and stealing money, and reacted with crying, making a fuss, and hitting walls.Under the hopeless circumstances, she discovered she could understand animal language. While other time-travelers were busy making money to support their families, she was just enjoying the show.“The deputy director's wife accepted five jins of pork from a patient's family. The old couple is squabbling behind closed doors right now.”“The Dean has had a flare-up of hemorrhoids these past few days and can't sit on a chair.”“Mr. Li's wife is a tough woman. That missing tooth on the left was knocked out by her.”“Tong Yao has improper conduct. She used to secretly meet people in the village.”Tong Yao didn't expect the day would come when she would be the talk of the town....One day, Tong Yao heard a stray cat at the door muttering, “Dr. Si is having a date with a nurse in the corridor.”Furious, Tong Yao went to catch them in the act, only to find the doctor was discussing a patient's condition with a nurse who was over fifty. Wanting to run away, Tong Yao found her escape route cut off by the doctor, who backed her against a wall, “So I heard you came to catch us, huh?”Tong Yao never expected the saying, 'Those who always walk by the river eventually get their shoes wet,' to come true.

Once through the pirates, Lu En became the son of Monkey d Dragon, a grandfather named Monkey d Karp, and an unreliable and neurotic younger brother named Luffy.

Fortunately, the ghost back system is activated!

The completion of the ghost back is 10%, and the training effect is increased by 100 times!

The completion of the ghost back is 20%, and the training effect is increased by 1000 times!

…

One day, Lu En, a ghost-backed master, appeared in front of Luffy who was shouting to go to sea, and made Luffy cry on the spot.

Luffy: “The pirates in the sea are all monsters like my brother? I don’t want to go out to sea!”

Garp: “For a long time, the two boys, Long and Luffy, with small arms and calves, I really doubt that they are not my sons and grandsons. Like Lu En, they are the grandsons of the old man!”

Warring States: “The strongest creature in the sea, land and air is Kaido? No, it’s Lu En!”

- Description from novelbuddy

Crossing to One Piece world, he became Roger’s younger brother.

Unexpectedly, Gol-D-Roger who was in his fifties had a teenage brother. But he was so weak.

Fortunately, at the age of sixteen, he actually found himself with a possession soul system.

He had attached to the master IP man, also to the White Phoenix and to Ge Nie with his strong ability of the Hundred Step Flying Sword.

If you think that he can only Purchase these? Then you’re wrong!

Pain, Itachi, Ichigo Kurosaki, as long as there is money, any soul can be Purchased.

- Description from Novelupdates