
Spoiler
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I didn't like him in the beginning too, but turns out he wasn't cheating at all. And the one who was putting money secretly in her pocket during her high-school days to help her was him not his brother. And he's basically been yearning for her for his whole life. He was happy he could be the one who gets to marry her, but he thought she was in love with his older brother. He was also doing the cheating scandals on purpose to throw off his family who was secretly behind FL's downfall. He was plotting revenge on his family for her. And also kind of for himself.
FL is also pretty cool, like yeah at the beginning she seems like she kept letting all the supposed "cheating" happen, but she never let him into her heart for real because her father cheated on her mom, and she was blamed for being born, so she would never let it happen again. She only ever really loved him until after he cleared up all his fake cheating. So, she's not a pushover.
i mean wtf with the early chapter