The man is Duke Kyrios Kailos, rumored to be the "Blood Wolf." He threatened that if Selen comes alone to the Kailos mansion, he would keep the fact that the person who wrote the Bluebird's letter was Selen a secret.

Selen fell into deep contemplation. What could be the reason for him asking her to come to the mansion in the dead of night? What does he intend to do there, just the two of them? Unable to find an answer, she sought advice from the souls of past holy maidens. The sisters, who lived their entire lives in the grand temple and maintained their purity until the moment they closed their eyes, responded like this.

"Youngest, is he handsome?"
"Yes."
"Then go. Listen well. Life is worth living, even if you can't have everything."