I'm pretty sure it was a manhwa released in the last couple years. I know it was a novel and I'm pretty sure they released a promo before releases the series.

From what I remember girl is transmigrated into a novel. She wakes up in jail not knowing why she is there or what novel she's in. Turns out she went to jail so her brother wouldn't have to go. The Warden knows her brother and had a crush on her so she is able to get things from outside the jail. Like medicine and booze she uses to bribe officers when she wants to walk around. In the basement is a man who is treated like a beast, the novels male lead. His family is the one who put him in jail. She visits him and tries to improve his living conditions ie. get him yard time. The male lead seems to act like a dog and when not like that he embarrasses easly. The fl and ml families are enemies so everyone thought she was trying to torcher him and not be nice.

If I remember the write up correctly it talks about how when the male lead gets out of jail he goes searching for the female to kidnap her but I never got that far in the story.

Ring any bells

I Met the Male Lead In Prison

~4400 manga completed
~1700 ongoing...

Yes this is it. 🙂 thanks so much