MTL - Mermaid Effect - Chapter 82

She regards him as an elder, respects him and esteems him; he cherishes her to the core, loves her deeply, and spoils and protects her—Shi Nuan married Song Yansheng, the business legend of T City, and this man was once her fiancé's Second Uncle!One day, Shi Nuan invited friends to her home.Friend: “Nuannuan, Mr. Song takes such good care of you, I'm so envious!”Shi Nuan blushed: “It's all for show, in private he's... quite indifferent to me!”That night, Song Yansheng embraced his little wife, his voice magnetic: “I heard you feel I'm indifferent to you?”Shi Nuan: “...”[Heartwarming true love, deep affections not too late, an uncle-loving story with an eight-year age gap, guaranteed quality. Recommended past works: 'World's Deepest Love', 'First Warm Marriage of the Noble Family', 'First Marriage of the Rich', new book 'Mr. Gu, You're Missing Me!']

A good-for-nothing man married a beautiful girl but was kicked off the bed on the wedding night. Furiously, he wrote a bill of divorce and ran away.
He was schemed a car accident in which he nearly lost his life. However, it turned out to be a blessing. He swallowed the soul that passed through the outer world, thus obtained superb medical skills and martial arts.
Later on, with the silver needles and invincible martial arts, he embarked on the road of counterattacks and was committed to his great dreams.

- Description from Novelupdates

This crossing is so strange, death crossing, game crossing, etc. are probably barely acceptable, but why can you cross even if the fish tank is broken?

and actually passed through the magic tree in “OVERLORD” that is said to be able to destroy the world?

No! It is sad enough to regenerate into a plant. The protagonist, Ainz Ur Gong, the undead king, has also accepted the adventurer’s guild mission and wants to kill me!

I want to change my destiny! Live! I want to-surrender!

Ainz: Since he has accepted the job commission from the Adventurer’s Guild, deliberate failure is detrimental to the prestige of Ainz Ul Christine (the “surrender” button has been deducted)

actually died as soon as he crossed, but there is still a chance to return~ from the beginning of the magic tree to this world.

I must change my destiny this time! Live!

- Description from novelbuddy

In the grand world of Nova, many different races exist such as elves, humans, dwarves and beastmen and through years of war, strife and competition the world has grown, becoming home to great empires and countries throughout the oceans and five continents. However, to the great creators the world has become stagnant and boring, ever since the calamity that was the Church of Light and their Holy White empire.

Now the Dark God has created a new race after years upon years of dedicated effort. A species that is like none other and his hope for Nova’s future….Dungeon cores, beings that have the ability to reshape the very world itself, entering the domain of the gods.

Join Frost a newly born first generation Dungeon core as he embarks upon his journey within Nova and carves out his place in the world. How will the world’s current denizens react to his birth? Will they be friends or foes? And most of all how the Light God react to this new addition to the world, will he accept them or seek to destroy them?

This novel incorporates dungeon building and management but most of that won’t fully take off until the later volumes when Frost has much more floors and money to play around with. This is not a solely dungeon story as the MC Frost will have to explore and interact with the world of Nova much like how an adventurer would and forewarning the story is slow. There’s a lot of details and avenues which the story goes into, not simply battles, wars and action, it follows all aspects of Frost’s life, his growth and interactions with Nova not only as a Dungeon core but also as a person.