Korean Seon, also known as Korean Zen, has a rich history and has been influenced by many notable figures throughout its development. Some of the most significant figures in the development of Korean Seon include Jinul, Taego Bou, and Seongcheol.

Jinul, also known as Bojo Jinul, is considered the founder of the Korean Seon tradition. He was a monk who lived during the Goryeo dynasty in the 12th century. Jinul was a student of Chinese Chan (Zen) master Dahui Zonggao and brought his teachings back to Korea. He emphasized the importance of meditation and the use of gongan (koan) practice in Seon, which helped shape the practice in Korea.

Another influential figure in the development of Korean Seon is Taego Bou. He was a monk and scholar who lived during the late Goryeo and early Joseon dynasties. Taego Bou is known for his efforts to reform the Seon tradition and make it more accessible to the general population. He also emphasized the importance of meditation and the use of gongan practice in Seon.

Seongcheol, also known as Seongcheol Daesa, was a monk who lived during the 20th century and is considered one of the most influential figures in modern Korean Seon. He was a strong advocate for the practice of meditation and the study of Buddhist scriptures. Seongcheol also played a key role in reviving the traditional Korean Seon practice, which had declined during the Japanese occupation of Korea.

Other notable figures in the development of Korean Seon include Gyeongheo, who was a disciple of Jinul and helped spread Seon teachings throughout Korea, and Taizan Maezumi, a Japanese Zen master who had a significant influence on the modern Korean Seon tradition.

In addition to these individual figures, the development of Korean Seon was also shaped by the various Seon schools and lineages that emerged throughout its history. These include the Jogye Order, which is the largest and most influential Seon school in Korea, and the Taego Order, which was founded by Taego Bou and focuses on the practice of meditation and the use of gongan.

In conclusion, the development of Korean Seon has been shaped by many notable figures who have contributed to its teachings and practices. From Jinul and Taego Bou in the past to Seongcheol and others in modern times, these figures have played a crucial role in making Korean Seon what it is today - a vibrant and influential form of Zen practice.