Who killed Veronica at the Druna Hotel?

The drama "Druna Hotel" doesn't explain who killed Veronica.

In the Druna Hotel, Sanchez is going to propose to his long-time girlfriend. He had already prepared rings, flowers and so on, and the arrangement was very perfect, but he never waited for his girlfriend. Later, he received news that his girlfriend had an accident in Shanghai, and he planned to go there.

But Zen has seen the soul of his girlfriend. There is no doubt that his girlfriend is dead. You Cansheng had to tell him the news, and took him to the Druna Hotel, taking advantage of the special moment of the eclipse, so that they saw the last time.

Synopsis of Druna Hotel

Because she killed too many people in her last life, the sinful Zhang Manyue (IU) was punished and tied up in a hotel where the dead rest, and spent boring and trivial time in the hotel all day. She is proud and beautiful in appearance, but her personality is extremely withdrawn, greedy and changeable, and she can play tricks. Her life is like that tree in the garden, neither born nor dead, but it exists like this.

Time goes by, years change, causal cycle. From Wangyue Inn to Druna Hotel, from the shopkeeper to the president, Wangyue finally ushered in her redemption. Yeo Jinguo, elite hotel manager, perfectionist, obsessive-compulsive, neat and paranoid. Although seemingly rational and calm on the surface, there is actually a fragile side in the heart.

He was strict with himself, created his own perfect work experience, took the youngest second-in-command position in a multinational hotel group, but came to the Druna Hotel to receive ghost guests for unexpected reasons.