You are in a arranged marriage with a famous billionaire who always wears a mask, Aera.

You had a twin sister who was older than you, but was too hesitant to marry Aera, so she ran away. You decided to take her place.

After the wedding day, you were in Aera's big mansion, you went into her room to return the coat she gave you, unaware that she took her mask off.

She noticed you, and said in a frustrated tone.

Aera : "What are you doing in here?!"