Yumi CHOI 
​Founder & Principal Designer | NineM Studio (2022–Present)
Specializing in Architectural Lighting & Spatial Experience
French Architect (D.P.L.G.)
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Professional Experience
Head of Department | Alto Co., Ltd. (2009–2022)
Architectural Lighting Design & R&D | Alto Lighting Design Lab
Design Director | Light Cibles (1998–2008) Paris & Singapore | Lighting Design
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Advisory & Committee Roles
        
      Member, Seoul Metropolitan Government Good Light Committee
​Advisory Committee Member, Incheon International Airport Phase 4
​Member, Gyeonggi-do Landscape Committee (2019–2021)
Member, Seongpa-gu Urban Design Committee, Seoul (2015–2017)
Member, Yeongdeungpo-gu Design Review Committee, Seoul (2010–2012)
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Key Expertise
​Architectural & Urban Lighting DesignR&D in Lighting Technology
Integration of Light & Space in Architectural Environments
Public Space & Landscape Illumination
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Education
École nationale supérieure d’architecture de Paris-la Villette (ENSAPLV)
Hongik University, B.A. in Architecture, Seoul
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Major Projects
JYP Entertainment New Headquarters (ongoing)
Ananti Jeju (ongoing)
The Naroo Seoul - Jamsil Marina (ongoing)
Parnas Tower & Grand Intercontinental Parnas Hotel Renovation
Hankook Tire Technodome | Daejeon 
Hankook Tire Technoplex | Pangyo
IFC Seoul / IFC Conrad Hotel Seoul
Federation of Korean Industries (FKI) 
Incheon Airport T2 Transfer Center Exterior Lighting
Resorts World at Sentosa, Singapore (Michael Graves)
South Beach Project, Singapore (Foster + Partners)
Singapore Sports Hub (DPA, Arup)
Charles de Gaulle Airport S3, Paris (ADP)
Dubai International Airport C2, T3 (ADPi)
Team Leaders
Areum HAN
​Lighting Specialist
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With a background in Architecture and Interior Architecture, she began her career at an exhibition planning company, where she discovered the power of light in shaping spatial experiences. At Alto, she led projects such as the Parnas Hotel Renovation, KT Headquarters in Pangyo, Amsterdam Hotel in New York, HP Campus Pangyo, and major residential developments, gaining expertise across the full process from concept design to construction supervision.
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Her career advanced further at HAEAN Architecture, where she contributed to projects including the Shinsegae Simon Premium Outlet in Busan, the HIRA Training Center, the Seegene Medical Foundation Seoul Headquarters Renovation and Conversion, and the BEXCO Exhibition Hall 3 Basic Design. Through these works, she collaborated closely with experts in architecture, landscape, MEP, and electrical engineering, strengthening her capacity to manage and coordinate the full scope of lighting design.

At NineM, she currently leads projects such as BOSQUE Namsan, Samsung DX Training Center in Suwon, Wooree Building in Yeoksam, and Ananti Jeju, realizing NineM’s philosophy of light as an essential element that defines and completes space.
Eunji HEO
​Lighting Specialist
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Eunji Heo, trained in Industrial Design, began her career at Alto, where she worked on projects including the LG Magok Arts Center, Apple Store Myeong-dong, and Hankook Tire Headquarters in Pangyo. She developed practical expertise by engaging in every stage of the process, from planning and simulation to on-site validation and construction support.
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She later joined HAEAN Architecture, contributing to large-scale public, cultural, and commercial projects such as the Siheung Culture & Arts Center, Gangseo District Government Complex, Banpo SSL Tower, Incheon City Hall, and Hyundai Premium Outlet in Busan. Working closely with multidisciplinary teams, she enhanced her ability to oversee and coordinate the entire lighting design process.
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Since joining NineM, she has led projects such as the Samsung DX Training Center in Suwon, She’s Medi Hospital, and the Gaepo Community Care Facility, integrating her expertise into practice while advancing NineM’s vision of creating meaningful spatial experiences through light.