Four letter end

A part of the story about the salvation of mankind. Time traveler Anička is in an abandoned subway in 2050. Her mission is clear. She is waiting for another traveler, Radek, who lost his memory and is stuck in the past. She wants to give him a message that might recover his memory. Hopefully, he can continue in his mission afterwards, which is so important for the rest of mankind. (FamuFest)