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Yoo Si-jin
Identity: Descendants of the Sun
Background: Yoo Si-jin is a captain in the South Korean Army's special forces. He and his friend Master Sergeant Seo Dae-young are off-duty when they witness a young man stealing a motorcycle and apprehend him. The thief, Kim Gi-bum, is injured during the chase and therefore sent to the hospital. Dae-young realises his cell phone was stolen by the thief and goes to the hospital with Si-jin to retrieve it. In the emergency room, Si-jin meets Dr Kang Mo-yeon for the first time and is instantly attracted to her.