Description: Seoul, Korea, AC 1786. 'Heesoo,' who used to be an ordinary girl, is living in this city as a detective, hiding her identity and even her gender. 5 years ago, she lost her family under false accusations and ran away, disguising herself as a man. She and her servant have been pretending to be noblemen, hiding their true identities. But her life is about to be thrown into chaos because of this noble girl 'Juhee,' who just showed up in front of her out of nowhere... Enjoy various mystery cases that reflect the phases of 18th century Korea, romantic affairs with charming characters, and absorbing stories that you create by making choices.