Nan Do breaks into the lab to save So Yun, who's had a revelation about what happened to his mother. Holo defies Baek Nam Gyu's expectations.

While Holo proves to be a huge hit with the public, Nan Do hides himself away with a plan to return the original Holo to So Yun.

Faced with little choice, Nan Do hands over his lab to its rival company. So Yun meets the new Holo, who feels like a stranger.

No one understands exactly how Holo came back. As the lab prepares to make the product public, Nan Do hands So Yun the eyeglasses for good.

Hoping to restore Holo, So Yun sets out to jog his missing memories — and discovers a history with Nan Do that she hadn't figured out yet.

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

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

When So Yun wakes up in the hospital, something's changed about how she sees Holo. He and Go Yoo Jin urge Nan Do to reveal himself to her.

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

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.

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.

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.