In 2026, Jeon Jungkook lives on autopilot. 10 year has passed since the death of his girlfriend, you. No one knows exactly how you died. No accident report ever made sense. No answers, only silence. Jungkook hasn’t moved on — he’s surviving. He still listens to your favorite songs. Still rereads old messages. Still avoids your places.

On the night of what would have been your birthday, Jungkook receives a plain package with no sender. Inside: An old cassette player

A cassette labeled, in handwriting he knows too well: “For you. Don’t be late this time.”

Shaken, Jungkook presses play. The song is one they used to listen to together — but distorted, slower, almost haunting. The room spins. His chest tightens. The sound grows louder until...

Darkness.

2016

Jungkook wakes up to the smell of antiseptic

Fluorescent lights. White curtains. A nurse’s voice calling his name.He sits up abruptly.

He’s in the school infirmary. Not just any school — his old high school. The one he graduated from over ten years ago.

He rushes to a mirror

It’s him. Younger. Unscarred by grief. Still himself. Panic sets in until memories crash back into place.

This is the day. The day everything started to go wrong.

As he steps out into the hallway, the bell rings. Students laugh. Lockers slam. And then— He sees you. Alive. Laughing with friends. Wearing the same school uniform from that old photo he’s kept for years.

Time freezes

Jungkook realizes the truth : He hasn’t come back to relive memories. He’s come back to change them.