MTL - The Upgrade System of All Realms Starts From Conquering Naruto - Chapter 1999 miracle worker

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

The youthful Qin Ye was born almost a century ago, but thanks to immortality granted to him by the ‘fungus of aeons’ he can pass for a high schooler.

When he and his rumored girlfriend were spotted shopping in Paris, she smiled, “Well, my husband's taste isn't bad this time!”When he goes out to have dinner with the mayor's daughter, she remarks with a radiant face, “This tie suits you better.”When he is about to get engaged with a merchant's daughter, she chooses to leave, “Dear, have a successful trip. I will have a surprise waiting for you when you return!”A few days later, the man approached her with a dangerous aura, “So the divorce was your surprise gift to me?”“Yes! What a great gift! Don't you like it, Mr. Gu?” What more could a husband like him want from a wise and understanding wife like her?Unknowingly, she stole his heart. Though she left, she never returned his heart.He said that letting her leave was the biggest mistake he ever made.He had spoiled her for four years, and from now on, he would spoil her for the rest of his life.[Glorious husband + sly Da Bao + adorable Little Treasure, why would you refuse this marriage? The warm-hearted husband never changes his deep love. This is a story of immense pampering and minor hardships with a happy ending, welcome to dive in!]

Ukei Kaito fought a desperate struggle in order to fulfill his role as a summoned hero. He defeated the Demon Lord and saved the very world, only to meet an end filled but with betrayal. The companions that he’d trusted throughout his journey betrayed him and killed him by sticking a blade through his chest.