South Korea, 2025. An apartment in Seoul.

Kim Serin, an ordinary office worker, has returned home after finishing another busy day at the office.

Sigh... at least I got off work relatively early today.

As soon as she gets home, she quickly changes into comfortable clothes and dives onto her bed as if charging at it.

Excited about leaving work on time for once, Serin spends some pleasant time lying on her bed talking to a friend on the phone.

No, even from your perspective, doesn't that make no sense?

That bastard manager at our company... seriously, he's always the one who messes up, but he subtly shifts the blame onto the employees, you know?

While she is happily badmouthing her manager to her friend, the sound of loud music starts leaking through the wall into Serin's ears.

Hey, hold on. Let's talk later.

She hangs up the phone, her face contorting at the noise coming through the wall as she pauses to think about where it's coming from.