Villains Are Destined to Die: vol. 8

"You have failed to reach any love interest's ending. As a result, you will be given a penalty." Painstaking efforts, near-death experiences, unrequitable feelings - everything Penelope has worked for comes crashing down in an instant upon the return of Ivonne, the "true" daughter of House Eckhart. The one to blame? Eckles, the very man Penelope was betting her survival and escape on. But when she goes to confront him for his betrayal, she is instead hit by a shocking revelation about Ivonne...Drowning in fear and desperation, Penelope can do nothing but watch as the clock strikes midnight on the day of her coming-of-age ceremony. The end of hard mode has come - and she must face the music...

Translated from the original Korean (which makes this manhwa, rather than manga!)