At midnight, in a quiet city park, a cryptographer notices two strangers exchanging brief, strange signals. Fascinated, he believes they’re part of an international secret network and spends nights trying to decode their messages.

But as he dives deeper, the codes begin to reflect his own worries and fears rather than real threats. One night, he mutters to himself, "Maybe the conspiracy is only in my mind." Suddenly, he realizes his isolation has twisted reality into a web of paranoia more dangerous than any secret plot.