AI Image Prompt for K-Pop Style Subway Birthday Billboard and Verification Shot
A practical image generation prompt shared by @almazing_st for ChatGPT, Grok, and Gemini that combines a single portrait photo with a Seoul subway K-pop birthda
Tech and content creator 남얘기 (@almazing_st) on X has shared a practical AI image generation prompt that synthesizes a K-pop idol-style Seoul subway birthday billboard and an authentic on-site verification shot from a single reference portrait. The prompt is compatible with major multimodal AI image generation tools including ChatGPT, Grok, and Gemini.
Image source: X @almazing_st
In K-pop fandom culture, celebrating an artist's birthday with large digital billboard ads across Seoul metro stations—and taking on-site 'verification photos' pointing at the display—is a widespread tradition. This workflow brings that exact aesthetic to personal photos, whether featuring yourself, a family member, or a friend, producing a realistic celebratory snapshot without physical outdoor advertising costs.
3-Step Creation Workflow
The workflow outlined by the creator is straightforward:
- Select an AI Tool: Open any modern multimodal AI platform with image input and generation capabilities, such as ChatGPT, Grok, or Gemini.
- Upload Photo & Enter Prompt: Attach one portrait photo and paste the prompt below, replacing the bracketed
[ Name ]and[ Date of Birth ]fields with the target details. - Review and Refine: Check the output to ensure facial consistency between the billboard and the subject in the foreground, as well as the typography.
Original Prompt Configuration
The original prompt is structured in Korean, as tested and optimized across multimodal image models. Users can copy the prompt directly into their AI tool of choice:
초현실적인 한국 지하철 생일 광고 사진.
사진과 같은 인물이
1. 지하철 전광판 광고 안에도 등장하고
2. 광고판 앞에서 자연스럽게 손으로 가리키며 인증샷을 찍는 모습으로 등장.
실제 서울 지하철역 분위기, 정면 구도, 타일 벽, 대형 디지털 광고판, 아이폰으로 casually 찍은 듯한 느낌.
인물의 얼굴, 헤어스타일, 분위기는 원본과 동일하게 유지.
부드러운 파스텔 톤, 은은한 빛감, 감성적인 K-POP 생일 광고 스타일, 세련된 한국어 타이포그래피 디자인.
텍스트:
“[ 이름 ] HAPPY BIRTHDAY”
“[ 태어난 날 ]”
자연스럽고 캐주얼한 전신 포즈.
실제 팬 생일 광고 인증샷 같은 분위기.
극사실주의, AI 그림 느낌 없이 자연스럽게.
English Prompt Reference
For English-centric multimodal workflows, the prompt translates to the following structured instruction:
Hyperrealistic photo of a Korean subway birthday advertisement.
The exact same person from the reference photo appears in two ways:
1. Inside the digital subway billboard advertisement.
2. Standing in front of the billboard, naturally pointing at it to take a verification snapshot.
Authentic Seoul subway station atmosphere, eye-level frontal composition, tiled walls, large digital display billboard, casual iPhone photo quality.
Keep the subject's face, hairstyle, and facial features identical to the reference image.
Soft pastel color palette, gentle ambient lighting, emotional K-pop birthday ad aesthetic, clean Korean typography design.
Text on the billboard:
“[ Name ] HAPPY BIRTHDAY”
“[ Date of Birth / Date ]”
Natural and casual full-body posture.
Authentic atmosphere resembling a real fan visiting their birthday billboard.
Photorealistic rendering with no artificial AI look.
4 Key Prompt Engineering Principles
The prompt succeeds by separating structural composition, spatial realism, and lighting attributes into explicit instructions:
1. Dual-Role Subject Placement with Identity Consistency
- Directing the model to place the reference subject both inside the billboard poster and in front of it as the visitor establishes a clear dual-subject scene. Explicitly instructing that face, hairstyle, and features remain identical ensures the AI preserves character continuity across both instances.
2. Authentic Metro Environment and Smartphone Snapshot Texture
- Calling for Seoul subway elements like tiled walls and large digital displays anchors the scene in a realistic setting. Specifying casual smartphone camera texture counters over-polished 3D render artifacts.
3. K-Pop Fandom Billboard Aesthetic and Typography
- Defining soft pastel tones, gentle lighting, and Korean typography reflects the distinct design language of Korean idol support ads, helping the billboard look professionally designed.
4. Natural Posture and Photorealistic Grounding
- Guiding the foreground figure into a casual pointing pose captures the spontaneous feel of a real fan verification shot rather than a rigid studio model pose.
Original source
- 남얘기 (@almazing_st) on X: October 3, 2026 Post