Robin Radhakrishnan (റോബിൻ രാധാകൃഷ്ണൻ), known on social media as Dr. Machan, is an Indian doctor, social media influencer, and motivational speaker born on 30 November 1989 in Thiruvananthapuram, Kerala. He completed his MBBS and works as a Duty Medical Officer in the Emergency Department at GG Hospital, Thiruvananthapuram. His family consists of his father, mother, and younger sister. He has received the Global Youth Achievement Award (2020) for his contributions to social media motivational content, which has resonated with audiences across Kerala and among the Malayalam diaspora. He built a following of over 500,000 Instagram followers through short motivational videos, health education content, and an authentic, relatable persona. He is known for championing mental health awareness and honest personal storytelling. In March 2022, he entered Bigg Boss Malayalam Season 4 and quickly became a central figure in the house - notably in a widely discussed emotional connection with fellow contestant Dilsha Prasannan, with the pair becoming popularly known as 'DilRuba.' In Week 10 (Day 69), following a physical altercation in which he pushed a rival contestant during a task, he was ejected from the house by host Mohanlal - the first and only ejection of the season. He finished tenth overall. Post-eviction, he announced a Malayalam film debut produced by Santhosh T Kuruvila (STK Frames), with the first look poster released by Mohanlal on social media.

Viral social media persona 'Dr. Machan' with 500,000+ Instagram followers; winning the Global Youth Achievement Award (2020); working as Duty Medical Officer in the Emergency Department at GG Hospital, Thiruvananthapuram; being ejected from Bigg Boss Malayalam Season 4 (2022) for physically pushing a fellow contestant; his love triangle storyline with Dilsha Prasannan.

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