He deceased in the age of 66. He had lived long at that time. He held very important positions in the government such as Daejehak, Ijopanseo, Hyeongjopanseo, and Samjeongseung. By helding these positions, he tried to overcome the hardships during the Japanese invsion. However, due to bitter and strong criticism from the opposite party, he was removed from governmental positions and returned to his hometown.
His governmental positions were restored soon, but he didn't go back there. Instead, he silently recorded his memories on the invasion during his latter days. In 1604, he finally finished the writing of Jingbirok.
Jingbirok is the records of 7 years between 1592(25th year of Seonjo) and 1598 and represents Master Seoae.
This book precisely records the relationships with Japan before the invasion, resisting activities of common people, helps from china, and warships to take over the sea.
The title of Jingbi was named from a sentence in Jusong Sobi chapter of Sigyeong(Book of songs): "Yeogijingibihuhwan(Preparing for the hardships by punishing myself)".
He recorded and wrote this in regrets and wishes that these war and hardships should not be happen again, then he named the book as "Jingbirok".
With "Nanjungilgi", this book has very precious values to study the situations before and after the invasion. Furthermore, the fact that he wrote this by himself who was famous for his calligraphies adds historical values more. Jingbirok is declared as National Treasure, with number of 132 in 1969 and "Yeongmogak" in Hahoe Maeul possesses it now.