Also known as Grandpa, the Heartthrob or Don't Fall for Me, I'm Just a Legend
When Beichen Jue transmigrates into the supreme ruler of an ABO romance novel, The Heiress's Revenge, and becomes the protagonists' "grandpa" in accordance with the plot, his child-rearing days begin. In name, he's their grandpa, but in practice, he's their dad.
He'll spoil the girls rotten, doing everything he can to give the heroines and female side characters the best of everything. As for the male leads? Hah. Boys should be raised tough. As long as they're alive, that's good enough.
When the protagonists grow up, Beichen Jue arranges for the heroines to attend an elite academy. They return with a vengeance and meet the male leads. Just as sparks are about to fly...
...What? Wait, you have a grandpa too?
...What? Your grandpa treats you that well? Unbelievable.
...I'm Grandpa's most obedient and beloved baby!
...Grandpa's right. Men are all terrible. They're actually trying to steal Grandpa's affection from me!
And so the male and female leads, each refusing to back down, start fighting.
When Beichen Jue learns that the protagonists have declared war on each other just like in the original plot, with the male leads looking haggard and the heroines heartbroken, he comforts his daughters, then calls his sons aside and gives them a thorough scolding. The icy male lead is reserved enough to keep his composure, but the playboy male side character cries out indignantly, "We weren't dating!"
Beichen Jue: "?"
Only later does Beichen Jue learn what the protagonists were fighting over, and he can't help laughing and crying at the same time.
"You're all my precious grandchildren." You are all my wings.
After his identity is revealed, the male leads grit their teeth. "Did you enjoy being called Grandpa?"
Beichen Jue mutters under his breath, "Actually, I thought of you as my sons."
The heroines' familial affection turns into something else entirely. "Grandpa, we've found men who treat us well!"
Beichen Jue flees in a panic. "You... Don't come any closer!"
Theme: Lighthearted and fun, with no profound message
You can try to delete the last chapter, it will be better