This is the 『Diamond Sutra』 from the Korean Buddhist scripture series.
『Diamond Sutra』 is the original title of the Diamond Sutra. It was first translated into Chinese by the Indian monk Kumarajiva and is one of the most recited sutras in the three countries of the East.
The Diamond Sutra is recited, recited, and copied by many Buddhists, and is widely distributed not only as a textbook for practice but also for academic and religious purposes, and is especially believed to be the most important scripture in the path to heaven.