HAPPINESS

EPISODE : 12

As Sae-bom donates her blood, she again watches the video Yi-hyun recorded for her. She calls his phone, but it goes to voicemail. Sae-bom spots Seo-yoon in the hallway and ends up going with her to visit her mother.

Seo-yoon's mother is lucid but doesn't look well. She tells Seo-yoon that she caught a cold and makes her keep her distance so she doesn't get sick before her surgery. Once Seo-yoon leaves the room, her mother says it's thanks to Seo-yoon's letter that she's been able to hold on for so long.

She asks Sae-bom to keep looking after her daughter and then urges Sae-bom to leave. She can't hold back anymore and turns, straining against her restraints.

Elsewhere, Tae-seok interviews So-yoon about the state of the apartment complex. He asks how many are currently infected and wants details about those who died from the infection.

Outside, Sae-bom promises Seo-yoon that she and Yi-hyun will visit her after her surgery. When Seo-yoon guesses that her mother is infected, Sae-bom assures her she'll get better. But Tae-seok later tells Sae-bom that Seo-yoon's mother probably won't last much longer.

Tae-seok hands Sae-bom the last remaining vial of the treatment and observes that her antibody count is decreasing. They need this vial to create more of the treatment. When he says the commander is coming to take her to the lab, Sae-bom asks if he's breaking his promise.

He's not. He has Sae-bom sneak out in military garb to evade the officers who've come to retrieve her. They arrive as Tae-seok injects Young-in with the treatment and surround him with guns raised. Once he's finished, he turns himself in.

On her way out, Sae-bom slips into Seo-yoon's mother's room. She takes out the vial and injects her with the treatment. She hears a gun cock and turns to find Ji-soo in the doorway, pointing her gun at her.

She berates Sae-bom for using the last of the cure, but Sae-bom argues she can't be the only one with the antibodies. Yi-hyun has her, but Seo-yoon doesn't have anyone, which is why Sae-bom decided to give Seo-yoon's mother the last dose.

Ji-soo sighs but switches clothes with Sae-bom and sneaks her out. Sae-bom gives her quick hug and starts to leave, but Ji-soo holds her back. When Sae-bom hilariously thinks she wants another hug, Ji-soo pushes her away and clarifies that people will be suspicious if she's unharmed. Although it was her idea, Ji-soo gets all nervous but eventually lets Sae-bom hit her in the face with the gun.

While Sae-bom escapes in the car Tae-seok prepared for her, Tae-seok gets an earful from the commander. Tae-seok explains that Sae-bom showed him there was a way to succeed without reducing people to statistics.

When she arrives at the complex, Sae-bom hands over the document Tae-seok prepared for her and is let in. She tries contacting Yi-hyun via the radio Tae-seok gave her, but there's no response. In case Yi-hyun is listening, Sae-bom says she never realized how much he meant to her, and she'll do whatever it takes to get to him.

At the command center, we get a peek into Tae-seok's next plan. When Ji-soo covers for Sae-bom to the commander and says she likely went abroad, Tae-seok intervenes. He reveals Sae-bom went back for Yi-hyun and then drops a key piece of intel: there's another antibody carrier in the apartment. He asks for authority to take over the operation.

Meanwhile Sae-bom gets Hyun-kyung and Soo-min to let her back in the apartment. When she asks about Yi-hyun, they go quiet.

We flash back to the previous day when Yi-hyun bit Andrew. Young-ok watches terrified from the doorway, but Yi-hyun comes to almost immediately. He calmly walks past her and down the stairs. Young-ok runs to Andrew and tries to pry the gun from his hand. Suddenly, he grabs her arm.