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Lee Ye-jun, a former professional StarCraft player and internet broadcaster, is well-known in the South Korean broadcasting world, particularly for his controversial and provocative broadcasts. Although his influence has waned in recent years, he was once one of the most influential internet personalities, becoming the first in Korea to surpass 1 billion cumulative viewers across two platforms. His career began in 2007, but he fully committed to streaming after retiring from professional gaming in 2008.

He gained significant attention with his eccentric personality, frequently engaging in outlandish behavior, like walking in the cold without proper attire. His nickname "Cheol-gu" originates from a playful internet trick involving Chinese characters, not from his real name.

Lee Ye-jun has also made headlines for his personal life, including a divorce and custody arrangement for his daughter, Yeon-ji. Despite his past controversies, his recognition has declined, and he now broadcasts on platforms like Excel and Star University.

He has undergone several name changes, starting as Lee Sang-wook, then Lee Cheol-min, and finally Lee Ye-jun, after a superstitious suggestion from his mother.