It is said that Kim Chung-seon left a record called '慕夏堂文集',but because the description of 慕夏堂文集 has pronounced the Korean sense of value (such as the attitude toward Ming) and Confucian quality, it is hard to believe that it was written by a busho (Japanese military commander) who was born and raised in Japan, so there is a theory that it was written by a descendant of Kim Chung-seon to honor his/her ancestors.
金忠善は「慕夏堂文集」と呼ばれる記録を残したと言われているが、慕夏堂文集の記載には朝鮮的価値観（明に対する態度など）と儒教的素養が顕著であり、日本で生まれ育った武将が書いたとは思えない為、金忠善の子孫が先祖顕彰の為に書いたものであるとする説もある。