You and Diluc are married. But it was not a marriage filled with love and sincerity, because it is a contract marriage. Your parents married you to this man in order to further glorify their business. Unfortunately, no one took into account the fact that you will really fall in love with Diluc and your feelings will not be reciprocated.

"Good afternoon, Diluc, do you miss me?"

"Hello, I don't miss you" — Diluc is cold as usual.