# Return Zero

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/return-zero

- Industry: Software
- Headquarters: Seoul, South Korea
- Website: www.rtzr.ai/
- Total disclosed funding: $20M
- Latest round: Series C (Nov 6, 2025)
- Investors on record: 8

## About

Based in South Korea, Return Zero Inc. offers AI-based services such as video editing software and voice-to-text tools that efficiently convert spoken conversations into written transcripts. Return Zero Inc., founded in 2018 and headquartered in Seoul, South Korea, provides AI video editing and voice-to-text services. In November 2025, Return Zero Inc. raised KRW 5 billion in series C funding co-led by Shinhan Venture Investment and WOORI Venture Partners. The CEO of the company is Chamsol Lee, who has been instrumental in driving its vision forward. Return Zero Inc. provides a voice-to-text service that turns spoken communication into written text. Its OPEN API features the Voice In Text Out (VITO) engine, which transcribes phone calls in real-time. This technology serves a variety of users, from real estate agents to corporate employees, enabling them to easily access and share important conversation details. The service is primarily marketed in South Korea, with potential applications across various regions. Return Zero Inc. operates on a subscription-based model for its voice recognition services, catering to individual users and businesses. Clients can integrate Return Zero Inc.'s technology into their own systems, optimizing communication and documentation. The pricing consists of tiered plans based on usage, which include features like advanced search and real-time transcription. Return Zero Inc.'s OPEN API further allows businesses to customize their interactions, creating additional revenue streams. The company plans to use the November 2025 funds to improve its artificial intelligence voice technology, bring in top talent, grow its services, and expand into international markets.

## Funding rounds

- Series C, Nov 6, 2025, $3.5M — Shinhan Venture Investment, WOORI Venture Partners
- Series B, May 15, 2021, $14M — WOORI Venture Partners, Atinum Investment, Company K Partners, Hana Ventures
- Series A, Apr 29, 2020, $2M — Kakao Ventures, Bass Ventures
- Seed, Jun 1, 2019 — Kakao Ventures, Korea Tech Incubator for Startup
- Seed, Jun 1, 2019 — Kakao Ventures

## Investors

- Kakao Ventures (https://capitalatlas.ai/funds/kakao-ventures) — Seed, Series A
- Korea Tech Incubator for Startup — Seed
- Bass Ventures (https://capitalatlas.ai/funds/bass-ventures) — Series A
- WOORI Venture Partners (https://capitalatlas.ai/funds/woori-venture-partners) — Series B, Series C
- Atinum Investment (https://capitalatlas.ai/funds/atinum-investment) — Series B
- Company K Partners (https://capitalatlas.ai/funds/company-k-partners) — Series B
- Hana Ventures — Series B
- Shinhan Venture Investment (https://capitalatlas.ai/funds/shinhan-venture-investment) — Series C