Hong Yeo-won, once the daughter of a noble noble family, faces financial hardship after her parents die in an accident. A familiar man appears. His true identity is Choi Geon-yul, her childhood fiancé, and he desperately asks Yeo-won to let him stay in her workshop...! But Yeo-won overlooks one thing: she currently makes a living carving "secret objects.

" "Do you know what these are used for?"
"They say they're used in brothels. Couples sometimes use them..."
"So. Do you know where and how they're put?"
"Put... in?"

After being caught with her "works" barely enough to make ends meet, Geon-yul makes an unexpected offer to help her earn more money.

"I'll show you mine."
"What?"
"I'll show you, so you can copy my pattern and work from it."