Nanomancer Rising: Divine Alchemist Reborn as Academy's Worst Teacher - Chapter 1:

The 7-year-old little crybaby met 11-year-old big brother who ran away from home.
[This man became the protector of redemption in his life]

The 16-year-old little dragon fell in love with a 20-year-old big brother.
[It’s a pity that the big brother didn’t recognize him as the little crybaby]

The 23-year-old single father and 27-year-old chief executive meets again.
[This time the little crybaby and his big brother are finally together]

Fortunately we met through hundreds of millions of people, Thank God, for letting us break through many obstacles and get back together again, falling in love with you and being with you again is the greatest fortune in my life.

- Description from Novelupdates

At 18, Alex Kain is whisked away to Eryndor, a game-like realm where he gains 'Skill Synthesis', a talent to fuse skills into godlike powers. Battling monsters and conquering dungeons, he builds a harem of strong women drawn to his might and charm. With the power to return to Earth bearing incredible resources, Alex faces a growing threat that endangers both worlds in this epic of adventure, romance, and ambition.

The Queen of the elves wants to bear his child, the vatican’s saintess is his maid and the empire’s princess wants to elope with him.

But his only concern was his delusion of taking down the creator of the world!

- Description from Novelupdates

After three years of marriage, Xia Zimu died on her and Gu Huaixi’s wedding anniversary.

She spent all her ten years of youth chasing him.

However, even though she was hit badly, until he died, he never looked at her.

After living a new life, she resolutely filed for divorce, and finally achieved a positive result with the man who had silently guarded her for ten years.

Seeing her being sweet with others, Gu Huaixi finally went crazy.

“Mumu, I was wrong, turn around and look at me, okay?”

Xia Zimu held Lu Jinghao’s hand, smiling like a flower.

“Sorry, Young Master Gu, I don’t have any place for you in my heart.”

- Description from novelbuddy