Season 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.

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.

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.

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.

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.

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.

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.

Can I take out the Holo trapped in the room?

Can the three of us be good friends?

There is nothing I can do.

Wherever you go, Holo.

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