Not all men are good to women just because they want to sleep with them, and not every one of these things is filled with sleaze and filth. There are always some people who genuinely want the other person to become better. Li Yifei just didn't want to snuff out that stubborn, tenacious spark in this girl's heart. He wanted it to keep burning, because it could light up Li Minjia's whole life. If it was doused now, whether this girl would fall or not was another matter, but she would definitely change, at the very least she wouldn't be so pure anymore.
As for Li Yifei himself, he's a guy with a strong sex drive—any woman in the Li family could testify to that. But that doesn't mean he's some horny teddy dog who'll hump the sky, the earth, and the air, spraying his seed everywhere. Li Minjia is great, but he's not about to use money to threaten her, and he's even less eager to just push her down and sleep with her.
