The one-of-a-kind prototype of Holo falls into Han So Yun's solitary life, eager to help with anything she needs — if she will allow him.

Seeing she has a crush on her co-worker, Holo offers to be So Yun's dating coach. Go Nan Do monitors their growing bond from his lab.

Nan Do moves in next door to So Yun, convinced that being with her has broken Holo, and determined to do whatever it takes to fix him.