Episode 1 - Is it a person or a ghost?

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

Episode 2 - I'll help you by your side.

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

Episode 3 - What the hell is that woman?

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

Episode 4 - He said he would be by my side.

Conflicted about her feelings, So-yeon tries to distance herself from Holo. Baek Chan-sung sends his men after her glasses.

Episode 5 - I only see you.

When So-yeon wakes up in the hospital, something's changed about how she sees Holo. He and Ko Yoo-jin urge Nan-do to reveal himself to her.

Episode 6 - I want to be with Holo, and I want to hold hands.

So-yeon realizes that loving Holo means certain relationship norms are out of their reach. Nan-do deals with unwanted attention from the police.

Episode 7 - You can't leave her alone in hacking, intrusion.

In danger from those attempting to steal the prototype, So-yeon agrees to stay at the lab. Nan-do puts on his best impression of Holo.

Episode 8 - Can I take out the Holo trapped in the room?

Episode 9 - Can the three of us be good friends?

Episode 10 - There is nothing I can do.

Episode 11 - Wherever you go, Holo.

Episode 12 - So-yeon recalls the most fearful moment in her life.