Hasn't The Contract Marriage Ended, Husband?

Diana, having married the elderly Marquis Caspel due to certain circumstances, was leading a peaceful and happy married life. Then, one day, Caspel lost his life in a sudden accident. Diana became a widow at a young age. Overwhelmed with grief, she yielded everything to his grandson, Alberto, and his lover, intending to follow in Caspel's footsteps. However, what was revealed at that moment was an unexpected will. The condition for the succession to the title and the inheritance was only one: a one-year marriage between the grandson and Diana. To repay the trust of the deceased Caspel, Diana accepted the contract marriage, vowing in her heart to watch over Alberto until he became independent as the heir. However, Alberto knew Diana only through rumors that she was a "villainess." Suspecting that she was after the inheritance, he treated her coldly. Nevertheless, Diana supported him, even while enduring her own pain. Faced with such devotion, Alberto's heart began to waver little by little. Conflicting feelings. Past wounds. And a state conspiracy surrounding the inheritance. A dramatic romance starting from a contract marriage.