Saves Wan-soo from a deadly terrorist attack in Manila and is assigned as her personal bodyguard. He develops genuine romantic feelings for her, though Wan-soo remains skeptical about his true intentions and loyalty to the Hwain Group.
Professional relationship that develops into romantic feelings
Do-yoon's sister
Do-yoon works for Hwain Group under Yong-kook
Professional colleagues in security/bodyguard field
Explore the full interactive character relationship map of Red Swan