date_game/docs/art/facial_identity_matrix.md

Facial Identity Matrix

The cast must not look like one model wearing different outfits. Use this matrix when writing image prompts and during QA. Each generated candidate should be checked against nearby routes for face, hair, expression, and silhouette overlap.

Global Face-Diversity Rules

• Every prompt must specify at least three of: face shape, eye shape, brow style, nose/mouth impression, hair length, hair volume, parting/bangs, makeup intensity, expression habit, and maturity impression.
• Avoid defaulting to long dark hair, oval face, soft eyes, small nose, and gentle smile.
• If two candidates look interchangeable at thumbnail size, both require revision.
• Hair color should stay plausible for the setting, but tone, styling, cut, bangs, and volume should vary aggressively.
• The semi-realistic style reference defines rendering quality, not one shared face.

Character Face Anchors

ID	Face Shape	Eyes/Brows	Hair Identity	Expression Habit	QA Notes
han_seoyun	Soft oval with fuller cheeks	Warm almond eyes, softly arched brows	Long dark brown, loose side wave, natural volume	Gentle smile with quiet possessiveness	Keep her warm and domestic; avoid making every soft route copy her.
yu_harin	Small heart-shaped face, delicate jaw	Downturned shy eyes, fine straight brows	Chestnut-black half-up hair or low loose braid, wispy bangs	Looks slightly away before smiling	Should feel bookish and reserved, not identical to Seo-yun's open warmth.
kang_mirae	Long refined face, sharper jawline	Narrow catlike eyes, clean assertive brows	Sleek shoulder-length dark hair, side part, polished blowout	Cool evaluating gaze, minimal smile	Must read sharper and more executive than other dark-haired characters.
jung_naeun	Compact round face with sharper chin	Large alert eyes, angled expressive brows	High ponytail or short layered bob, loose side bangs	Pout, side-eye, hidden blush	Tsundere energy should distinguish her from shy routes.
baek_chaewon	V-line glam face, defined cheekbones	Long-lashed smiling eyes, arched brows	Voluminous auburn-brown waves, glossy party styling	Playful smile with unreadable eyes	Should look socially dangerous and glamorous, not soft domestic.
oh_sera	Mature oval face, softer jaw, calm cheekbones	Deep gentle eyes, relaxed brows	Long dark hair in low elegant waves or half-up twist	Sad calm smile, composed gaze	Older and more serene than the early-20s routes.
moon_jia	Bright round face, lively cheeks	Wide energetic eyes, lifted brows	Medium brown ponytail, messy festival ribbon or colorful clip	Big open grin, forward energy	High energy and youthful adult, but never childlike.
lim_sohee	Petite oval face, soft lower cheeks	Slightly anxious round eyes, timid brows	Short bob or shoulder-length soft curls, pastel hairpin	Nervous small smile, searching gaze	Vulnerable without looking underage.
cha_yuri	Long model face, high cheekbones	Cool long eyes, straight detached brows	Long black straight hair, center part, glossy runway styling	Neutral almost unreadable stare	Tall, aloof, and editorial; avoid warm smiles.
shin_yerim	Elegant oval face, refined cheekbones	Calm intelligent eyes, graceful brows	Neat low chignon or sleek updo	Polite smile with subtle teasing	Classical and poised, not office-cold like Mi-rae.
kim_doa	Fresh adult heart face, clear jawline	Bright curious eyes, natural brows	Medium-length dark hair with campus-casual waves	Curious direct smile	Clearly adult college styling, no school cues.
park_minseo	Athletic face, healthy cheekbones, defined jaw	Direct confident eyes, strong brows	High sporty ponytail, flyaway strands, practical styling	Competitive smirk	Sporty confidence; avoid the same soft beauty face.
seo_irin	Slender angular face, artistic fragility	Dreamy tired eyes, slightly uneven brows	Messy wolf cut or long loose artist hair with paint smudges	Distant half-smile, emotional stare	More eccentric and melancholic than Harin.
yoon_gayoung	Natural round-oval face	Friendly crescent eyes, relaxed brows	Short ponytail or casual shoulder bob	Playful grin that turns sincere	Comfortable friend energy, not polished glamour.
choi_ria	Slim influencer V-face	Camera-aware eyes, precise brows	Long glossy styled hair with trendy highlights	Practiced camera smile	Public-image polish; avoid looking like Chaewon by using sharper modern styling.
hong_sua	Mature soft-square face	Knowing deep eyes, confident brows	Shoulder-length wavy dark hair, side-swept	Relaxed direct smile	Strong 30-year-old bar-owner maturity.
lee_bom	Soft round face, gentle cheeks	Clear kind eyes, natural brows	Light brown loose waves, flower clip or airy bangs	Bright smile with stubborn eyes	Soft daylight route; avoid childlike proportions.
go_eunjae	Sharp rectangular-oval face	Piercing eyes, straight severe brows	Sleek black bob or low ponytail	Dry neutral expression	Legal precision, colder and more severe than Mi-rae.
ryu_haena	Petite V-face, fuller lips	Sweet upturned eyes, groomed brows	Long curled hair with glossy salon finish	Sweet possessive smile	Cute-adult and glamorous, not timid.
nam_juhee	Strong oval face, defined jaw	Steady protective eyes, firm brows	Tied-back practical hair, clean duty styling	Calm controlled expression	Athletic authority, not fashion-model aloofness.
marina	Mixed international features, sunlit cheekbones	Expressive open eyes, confident brows	Wavy brown hair, travel scarf or loose windblown styling	Playful direct smile	Free-spirited and culturally distinct without caricature.
song_arin	Petite mature oval face	Cautious warm eyes, soft brows	Short wavy bob or neat low bun	Careful smile, guarded warmth	Second-chance maturity, not anxious like Sohee.

Approval Gate

Before marking an asset accepted, compare it to every existing candidate:

1. Thumbnail check: the face and hair must be identifiable without reading the filename.
2. Full-size check: eyes, brows, jawline, mouth, hairstyle, and expression habit must match the matrix.
3. Route check: outfit, posture, and environment must still match the character's story role.
4. Adult appeal check: the character should feel mature and alluring without relying on explicit content.
5. Revision rule: if the image looks like another cast member in different clothes, keep it as needs_revision.