My Tenant Is a Ming Dynasty Heir

“I'm a 21st-century restorer of ancient books, renting out the west wing of my courtyard home. My new tenant is devastatingly handsome, but his speech and manner are old-fashioned. He watches the stars at night and even claims to be a Ming prince. I thought he had a severe case of chuunibyou, until he showed me a genuine royal seal... What's worse, he's investigating a case that leads to the ancient books passed down in my family, and he asks me, ‘Miss, would you help me clear my name?’”