We bring practical AI to the world
We bring practical AI to the worldReturnZero is a pragmatic AI startup

We bring the latest AI technology from the lab to the real world, shaping the future transformed by AI.

Founded In


Total Voice Data Processed

15 million hours+
(approximately 1,712 years)

Total User Count

1 million+

Total Investment Received

(Series B)


Arc (Chamsol Lee)

Bachelor of Computer Science, KAIST
Kakao AD Business Unit
Founder / CEO of Lotiple (Acquired by Kakao)

Homura (Juyoung Jung)

KAIST Computer Science
Kakao KakaoTalk PC Team, Messaging Team
Lotiple CTO / Co-founder
ACM-ICPC World Finals 17th Place

Rene (Hyunjong Lee)

Bachelor of Computer Science/ Master of Electronics, KAIST
Worked in Kakao's KakaoTalk and Kakao Taxi teams
CPO and co-founder of Lotiple
Worked in LG Electronics' New Business Development team

JK (Jeongkyu Roh)

Head of Research
Bachelor and Master of Computer Science, KAIST
IDeCka CTO Research/Development Lead
GoYoung Technology Solution Lead
Sommers, Moses Research/Development

Arthur (Dongwoo Kim)

Head of ML Engineering
Bachelor of Computer Science, Master of ML, KAIST
ReturnZero (Speech-to-text, Speaker Diarization, MLOps)
KakaoBrain (NLP, Vision)
Kakao (iOS, SDK, Data Science)

Dan (Joonwon Lee)

Lead ML Engineer
Bachelor and Master of Industrial Engineering, Seoul National University
SK Telecom Machine Learning Engineer (AD-Tech, RecS)
Kakao Data Scientist (AD-Tech)

Link (Hangil Kim)

Bachelor of Computer Science, KAIST
Master of Education from Seoul National University
National Lifelong Learning Promotion Institute K-MOOC Operation Center

Kay (Hyosin Kim)

Bachelor of IT Management, KAIST
Certified Public Accountant (KICPA)
Continental AG APAC Compliance
CFO at Bank Salad

David (Hojun Yu)

MangoPlate Research and Development
Jitell Global Chief Researcher
Kyung Hee Sports Fanatic CTO
Escore Special Research Officer

Pierce (Sanghong Ahn)

ML Engineer
Ph.D. in Electrical/ Computer Engineering, KAIST
Senior Researcher in the Cloud Network Systems division at Samsung Electronics Network Business

Danny (Hoseok Ryu)

Lead S/W Engineer
KAIST Computer Science Master's Degree
Co-founder & CTO of Mangoplate (Acquired by YEOGI KWAEOP)
Kakao KakaoTalk Server Development Team
Developer at Kakao, Samsung Electronics, and Tmax

Michael (Seungho Choi)

Head of Business
Atlas Labs (Head of Business, secured a voice recognition contract worth 2.5 billion KRW)
Haden Korea (Co-founder)
Bachelor of Materials Science and Engineering from Sejong University


Kakao Ventures
Company K Partners
Bass Investment
Woori Venture Partners
Hana Ventures


Stay updated with
ReturnZero's important news

2023.06.14 08:30:00

리턴제로, 오픈AI CEO 초청행사 참석… “챗GPT 적용 신규 서비스 곧 출시”

2023.06.14 08:30:00

인공지능(AI) 기업 리턴제로가 지난 9일 서울 여의도 63빌딩에서 열린 ‘K-스타트업 밋 오픈AI(K-Startups meet OpenAI)’ 행사에 참석했다고 밝혔다.

2023.06.22 08:00:00

“기술 진보 자체보다는 사람들에게 얼마나 필요한지가 중요” 눈으로 보는 통화 앱 개발에 뛰어든 사연[스테파니]

2023.06.22 08:00:00

안녕하세요 스테파니 독자 여러분! 동아일보에서 스타트업 취재를 담당하고 있는 김하경 기자입니다. (스테파니는 ‘스’타트업과 ‘테’크놀로지를 ‘파’헤쳐보‘니’의 준말입니다.)

2023.08.07 09:26:02

리턴제로, AI 숏폼 편집 자동화 서비스 ‘아이코(AICO)’ 정식 출시

2023.08.07 09:26:02

리턴제로가 내가 만든 영상 콘텐츠를 숏폼 영상으로 알아서 변환해주고 자막까지 달아주는 서비스를 선보인다. 국내 대표 인공지능 스타트업 리턴제로(대표 이참솔)는 AI 기반 숏폼 편집 툴 ‘아이코(AICO)’를 정식 출시했다고 7일 밝혔다.


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