Shikkaku Mon no Saikyou Kenja~ Sekai Saikyou no Kenja ga Sarani Tsuyoku Naru Tameni Tenseishimashita~ - Chapter 9 Strongest Sage, Join the Sword Practice

Every novel has a slag character, the one who decides to abandon the protagonist at his lowest, most helpless point, either because he can’t stand the poor guy’s circumstances or for other reasons. But after the protagonist wins his way in life again, they’re the ones who beg with broken sobs to be taken back.

Still, water once spilled can’t be recovered again.

Yet the unlucky Shen Jiayan has been bound to a Water Recovery* System to do just that.

*water recovery – comes from an idiom that means “spilled water can’t be recovered” (English equivalent: there’s no use crying over spilt milk).

- Description from Novelupdates

He died on the wedding of the girl he had a crush on, after a long and successful career. After convincing Yama to send him back to the world, he decides to fix the areas in which his life went wrong. Realizing the lack of love and romance in his past life, he sets out to conquer the hearts of various women.

In her previous life, her family was destroyed.In this life, she was reborn and decided to save her family, never letting history repeat itself. But with all the men in her family having already sacrificed, how can her family rise again? At this moment, he appeared and said, “Your family belongs to a prosperous lineage, and for a hundred years, there has never been any waste of talent, including among women.”Later on...The eldest sister became an invincible warrior, the second sister a formidable head of the household, and the third sister a wealthy merchant. Her family was rejuvenated.Because he had helped her countless times in her previous life, she secretly returned the favor in this one.On a snowy night, outside the city wall:“You've saved me so many times, do you like me?” he asked.“No, you are mistaken,” she replied.“Then if I've saved you so many times, can you grow to like me?” he asked again.

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