Direct romance not really, but probably harem ending. Leo Flov would be a king, and at least he has several wives later on. Probably Iliyana (red head girl, his classmate), Chelsea, elena geron (lumerne's queen), Chen xia (but this is questionable since she is an emperor herself), lunia (redhead elf), eiran (elf girl, berkia descendant), and probably Lysinas.
I said probably, based on the episodes when his future grandchildren, she call some of them grandmas, and Lysinas would be resurrected through hero record power and stay for a few years. That just probability and those girls are what the author describe as love interests.
┐( ̄ヘ ̄)┌ I am just saying from what I read, maybe right maybe wrong
As far as I read, that's my conclusion (づ ̄ ³ ̄)づ and Leo might no longer consider those children as child, but his equal as hero. But romance, except Lysinas that he met through hero records, not many would make him restless and see romantically (Leo still denied it but he loved Lysinas in my perspective, though newest episode on Leo's hero record, Kyle said Lysinasis his type).
Leo is lonely, And he only want to have happy memories with his old friends.l after so much hardships. He want to resurect all great heroes, and that's what future Leo doing by abusing Hero record to his own advantages—Based on his future granddaughter saying. But only Lysinas able to resurect, and stay for a few years before completely dissappear.

Hmmmmm can someone spoil me so I can read this