This was my first time to have a close encounter with the autumn foliage by hiking in a mount overseas. Due to the size of the venue and the natural /random allocation of the foliage, the landscape was spectacular and the feeling of embracing by wide varieties of foliages were really fresh and great.
There are a lot of entry points around the National Park, i entered the Park via the Bukhansan Visitor Centre 북한산성탐방지원센터 which is at the Western side. The course I took actually can reach 백운대, the highest Peak of the Bukhansan (836m) , but i had to return after reaching 보리사 as the sun got dim quickly at around 4pm. I should have started early. Anyway it was already a big bonus for me as i just made up my mind to go there that morning.
Please note that wet tissue is nearly a must as there is no access of water in this National Park . However, this National Park is close to Seoul and of good access of public transport, plenty of large sports outlets, restaurants, convenience stores, food stalls etc at the entrance, clean washrooms are found along the trails whenever you needed it.
The attitudes of the Koreans, as usual, are serious and their gears are professional. Many of them use a pair of hiking poles and they are generally walking at a fast pace. They could not tell by appearance if am a Korean or not. After they knew that i am a foreigner, most of them immediately asked if i am a Japanese, maybe Japanese are well known at hiking.
http://bukhan.knps.or.kr/front/portal/visit/visitCourseMain.do?parkId=121500&menuNo=7020092
By the way, there is a circular trail 북한산 둘레길 around the whole National Park, the Southern routes, at Area #4 to #7, are most close to Seoul.