Silent Hill: The Short Message was first rated for unspecified platforms by the Game Rating and Administration Committee of Korea back in September.
Silent Hill publisher Konami held a “Silent Hill Transmission” digital event in October, where it announced several new Silent Hill projects including a remake of Silent Hill 2, Silent Hill: Ascension, Silent Hill: Townfall, and Silent Hill f. A game titled Silent Hill: The Short Message was not announced.
Update 4:30 p.m.: The rating has been updated with an official artwork and description. It reads (Google-translated from Traditional Chinese):
Anita came to an abandoned apartment in order to meet her friend Maya, and somehow woke up to find herself trapped in it. She must escape her own fears and the monsters lurking in the corridors, discover the truth behind the events she’s trapped in, and try to escape before her own trauma consumes her will to survive.
Here is the artwork and rating: