Stage Name: Thunder and Cheondoong
Birthday: October 7, 1990
Position: Lead Rapper, Lead Dancer, Vocalist
Height: 181 cm
Weight: 65 kg
-His older sister is 2NE1's Dara
- He is considered the most innocent member in the group
-Although his body is not the best in the group, he is not afraid to show it off
Thunder was born in Busan, South Korea but grew up in the Philippines, where his eldest sister, Sandara Park, achieved nationwide fame in 2004 after winning 2nd place in a talent search reality competition. He first appeared on national television when he attended the finale with his mother.
Later on, as his sister began her hectic activities as a celebrity, a crew from one of South Korea's biggest TV agencies recorded her daily life in the documentary, "My Name Is Sandara Park." This marks Thunder's first ever appearance on Korean TV.
After training under Rain and J.Tune Entertainment, Thunder became a member of South Korean quintet male group MBLAQ, serving as a vocalist, lead rapper, lead dancer and also considered as MBLAQ's visual. The group debuted on October 9, 2009 at Rain's Legend of Rainism concert where they performed various songs from their then-unreleased single album Just BLAQ. Their performance was met with praise, with many concert spectators and fans considering them to be the next TVXQ.