Might be irrelevant but I don't know where to ask other than here. What is the name of this temple and the mountain behind it on Taekwondo forms educational videos:
Is this temple of any importance regarding Martial arts?
This appears to be Gyeongbokgung in Seoul
Other than being the Royal residence during the Joseon dynasty (original palace destroyed by the Japanese and rebuilt recently) it doesn't particularly have any martial arts importance.