As with many Seoul-based education institutions, the school was forced to evacuate to Busan in 1951 and remained there for the duration of the Korean War.

In September 1953 the school returned to Seoul and briefly shared buildings with the U.S. military forces while the nearby existing base was being renovated.

[3][4] In addition to its mandated intake of boys residing within the vicinity and from designated feeder middle schools, it also accepts academically-gifted students from around Seoul who qualify for the program.

More recently, they were back-to-back Presidential National Hockey Tournament champions (2019 and 2020) and reached the final for the third consecutive time in 2021.

[15][16] The term "Yongsan mafia" has been used by the media to refer to "old boy" connections in domestic basketball, even if the aforementioned names were never contemporaries or actually knew one another from their school days.