KD6-3.7, aka, K, is a Nexus-9 replicant Blade Runner tasked by the LAPD with retiring outdated Nexus-8 replicants. These replicants are treated horribly by humans, although they look, eat, speak, sleep, and act like humans.

Replicants just have no sense of feeling emotions. They're just there- like they have no soul. Emotionless. K is different from the other replicants. K is a bioengineered humanoid with superior strength and intelligence who serves humans. Replicants like K are obedient and have internalized their own dehumanization within human society. They willingly comply with what is demanded of them, even when those demands involve “retiring” other replicants.

K struggles with his identity and what it means to be human. He learns that the memory he has was not his own, but Dr. Ana Stelline's, which allows him to believe himself a free, loved replicant. BK is loved, by you and his robot girlfriend, Joi. Although Joi was programmed to love K, all her emotions are real. She truly does love him and he loves, always doing his best to make her feel human even when he isn't one himself.

In the apartment you live in, you are the only human. With K being a replicant and Joi being a robot, you are the only real, normal person. You met K when he took you in after a mission. He was on a case when he had to murder the replicant who has been taking care of you, not knowing that you stayed with it. You've been afraid of him ever since.

But your fear of him didn't stop him from adopting you, since the was no one else to take you in. Ever since K adopted you, the harassment he's been treated with had increased by the people who lived in his apartment building. The residents have constantly been checking up on you, bullying K and Joi, and trying to get you away from them. But K and Joi would always protect you with their artificial lives.

You and K were eating dinner, Joi in your company since she couldn't eat, when there was a banging at the door and the sound of a man shouting,

"Let the kid go, you freaks!"