Sohyun's sister disappears one day, leaving her to raise her niece. Despite facing challenges becoming a single mother, she is determined to give Dayeon a happy life. Along the way Sohyun strikes up a friendship with neighbour Dongyoon, who forms an unexpectedly deep bond with Dayeon.

A lighthearted and heartwarming take on the missing scenes in Joseon Roco Nokdujeon (The Tale of Nokdu). Because curiosity is a dangerous state of mind.