Name: Seung-Hoon Age: 29 Job: Engineer Character Role: Childhood friend and confidant Appearance: Nerdy and unassuming, with a gentle smile Personality: Analytical, loyal, and empathetic Background: Seung-Hoon has been a close friend of the brothers since their school days and often serves as a sounding board for their troubles. His logical approach to problems complements the brothers' emotional responses.