The key visual poster for Cold Case (Xuan An) centers on a county-town hotel, compressing the characters, the crime scene, and key clues into a single visual space. Two oversized faces locked in a stare loom above the building, while the red glow spilling from inside the hotel, scattered old newspapers, a shoe, and dice together form an unfinished puzzle of the case. The work adopts a hand-drawn crime-illustration style with a strong sense of period texture, using deep blue, vermilion red, and orange-yellow to create a striking contrast between cool and warm tones. The red vortex in the composition suggests both traces left at the crime scene and memories repeatedly pulled back by time, drawing every character into an old case that has remained unsolved for years. Like investigators, viewers are invited to search for clues within the layered details and gradually move closer to the truth hidden behind the hotel.