Yu Jeong-Min is a South Korean speedcuber. He set the 3x3 average world record in 2007. He took a break from competitive cubing between 2008 and 2010 to fulfill the mandatory South Korean military service of 21 months.
- 3x3 speedsolve: First official sub-13 and in fact sub-12 average (11.76)
- 3x3 one-handed: First official sub-20 single (19.34)
Gungz was present at the first competition in January 2006. However, because he did not register on time, he did not officially compete. At the first competition, while the winner of the competitor (a 15 second cuber at the time) was being interviewed, Gungz went to the StackMat timer with display (a rarity at the time in Korea) and did a 12 second solve, impressing all the journalists present.
- Speedsolving.com: Yu Jeong-Min : 10.74 average of 5 (2011)