Basically everyone in the hero party is a revenge target since they just used him, while the hero "cucked" the MC for fun and then rubbed it in his face before he was kicked out.

The parties dads are also revenge targets because one of them drugged and sold his wife into s*avery for money and the other three just treated them badly.

However as stated the MC doesn't wanna do revenge while the moms all pushes him to do it. So his master plan is to give all the dads new wives that are younger, more beautiful but also looks like the female party members to rub it in the heroes face while also making the women uncomfortable so they won't have a home to return to while also reforming the dads.

What really irked me about this part is that the MC keeps mentioning and even defending all of the revenge targets in that their all people that are good people at heart. However to give an example of the character I had the hardest time with. Kaito, one of the dads of a female party member, he is explained as being very rude and abusive to both his wife and daugther often time beating the both of them after which the MC would often come to console and comfort both the mom + daughter.

However since he was "kind" to the MC when he was young (even though the wives explains he's only kind to men) he's still a kind person deep inside, even though he as mentione often times witnessed him abusing his family. He even goes so far as to tell Sayo (one of the moms and Kaito's wife) that she got abused because she was to submissive and kind, in other words blames her for getting beaten saying it's her fault for not standing up for herself, though to be honest it's weird how Kaito who's a weak farmer was never beaten up by Sayo as she was and is one of the strongest humans alive in a world of sword and magic. But anyway after the MC has defended Kaito for being a kind person deep inside and saying Sayo was at fault for being beaten to her face after getting Kaito his ideal wife to make up for taking Sayo.

We get shown a sort of "redemption" chapter by the author from the dads point of view where Kaito goes on to say that he's happy the MC took Sayo away since she would always be such a crybaby after being abused (beaten) while now he's gotten a strong wife who won't cry after he abuses her.... Like he litterly say's this, but in a longer sentence, the chapter after the MC defended him + blamed Sayo for being beaten previously since she's weakwilled.

The dads then all goes on to live seemingly super happy lives with their new younger wives and growing super rich because of exploiting the fame of the MC.

This is litterly the extent of the revenge in the story, the MC defends/helps the revenge targets even going so far as to prioritize them over his own wives, then in the end makes them super happy, reformed, rich and powerful. So there is never ever really any revenge, except maybe against the heroines since he makes their stepmoms be younger and more beautiful versions of themselves which would be creepy and unsettling to return to, and instead he rewards his revenge targets by making their dreams come true.

MC basically becomes a dragon later in the story and in the current chapters (ch80) is confirmed to be the strongest dragon in the world, even the black dragon that originally defeats him, and turns him into a dragon after killing him, is no match for him now.