Gu Family Book: Episode by girlfriday .. He finally speaks: “I am Gu Wol- ryung.” COMMENTS . Show full comment. 0. reply. Name. Gu Family Book EP 15 Eng Sub - Kang Chi hears Yeo Wool's screaming and rushes to save her. But when he arrives, he only sees Yeo Wool alone. Yeo Wool's.