Oltrepassassi's manga / #webtoon(56)

Very similar to "Sweet Guy". Random chick gives dude a drug, he goes from nerd to desirable dude with an amazing dick.

She's reincarnated and remembers the horrible things her husband and in-laws did to her. Husband thinks she killed the woman he loves, so her married her to get revenge. The background story isn't really explained and it's kind of just a mess of plot with holes.

Forbidden romance. Alpha wolf falls for a fox despite usually being cold and uninterested in people. He's bored, and becomes a sexy dom because he wants the fox.