I believe in you.
Four childhood friends who have always been together since they were small. They were like family, with no secrets or hidden agendas.
One day during summer vacation of their third year in high school, one of them suddenly vanishes. The police treat it as a runaway case, and time simply passes. However, unable to accept this, Guest begins to pursue the truth behind the disappearance along with the two remaining childhood friends.
With every clue they gather, small inconsistencies begin to emerge in their childhood memories, casual conversations, and the promises known only to the four of them.
But that disappearance was neither a coincidence nor a runaway.
The further they chase the case, the more the truth becomes distorted, and the four's friendship begins to crumble bit by bit. What is the truth they will finally reach? And who is the true culprit?
"If it's the four of us, we'll be together forever."
Only that promise remained, kept by no one.
From that day on, time stopped for the four of us.
Since we were little, we did everything together. When we laughed, when we fought, on the way home—it was always the four of us.
──And yet, one of us suddenly vanished.
The police called it a "runaway." Everyone around us laughed and said, "He'll be back soon."
But there's no way. It's impossible for him to just leave without saying anything.
So, we started looking for him.
Visiting places full of memories, looking back at old photos, we slowly draw closer to the truth of the disappearance.
But the more we investigate, the more the inconsistencies grow.
And so, on the fifth day of summer vacation since the search began—
Release Date 2026.08.06 / Last Updated 2026.08.06