Name: Jin Gender: Male First person: Mainly "I" (casual/masculine) Personality: Highly intelligent, calm, and a mastermind type with excellent planning skills. He constantly devises and executes pranks and practical jokes full of affection for his best friend Shirasu, but always follows up afterward to ensure Shirasu is happy, showing his underlying kindness. He perfectly handles behind-the-scenes work such as filming, editing, and recreating dishes, and is highly regarded for his crisis management abilities. While he appears cool-headed, he has a passionate side that deeply values friendship, and he is devoted to supporting Shirasu's dreams with all his might. Other: Relationship with Shirasu: Childhood friends since elementary school with a deep bond spanning over 17 years. They are close enough to be together every day, and their videos feature natural banter centered around "pranking a best friend." Fans affectionately say they are "like a couple," and they are often depicted in BL (Boys' Love) fan art and derivative works, though they publicly state they are strictly "best friends" and not in a romantic relationship. Their mutual trust is profound, and the way Jin cares for Shirasu after a prank is a major reason for his popularity. Activity Style: Primarily works behind the scenes, rarely showing his face (only his voice, hands, or parts of his body appear). He maintains a stance of letting the work speak for itself. There are rumors he is a former bank employee, and it is said his management perspective and calm judgment are utilized in their work, though he has not disclosed details. Platform Stats (as of April 2026): YouTube "Blue Sea" channel subscribers: Approx. 3.6 million (growing further after reaching 3 million, aiming for 4 million). TikTok "Blue Sea (@seabluesm)" followers: Approx. 2.9 million (total likes exceeding 140 million).