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Seoul-based Return Zero Inc. provides AI voice-to-text and video editing services, including real-time phone call transcription.
Return Zero Inc. was founded in 2018 and is headquartered in Seoul, South Korea. Its Voice In Text Out (VITO) engine, offered through an OPEN API, transcribes phone calls in real time for users ranging from real estate agents to corporate employees. The company also offers AI video editing, sold on tiered subscription plans to individuals and businesses. In November 2025 it raised KRW 5 billion in Series C funding co-led by Shinhan Venture Investment and WOORI Venture Partners. CEO Chamsol Lee leads the company.
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