Park Sang-hyun (Korean: 박상현; born October 7, 1990) better known by his stage name Thunder/Cheondung (Korean: 천둥), is South Korean singer, rapper, dancer, songwriter, actor and model. He is former member of South Korean boy band MBLAQ. In December 16, 2014, it was announced that Cheondung had departed from the group to focus on studying music for a while. In February 11, 2015, He was signed on Mystic Entertainment's music label APOP.
Aside from his native language Korean, he is also fluent in English and Tagalog, and can speak conversational Mandarin and Japanese.
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 marked Thunder's first ever appearance on Korean TV.
"We, the host of Seraphim, the armies of bright,
We do not rue the dire event
That, with sad overthrow and foul defeat, hath lost us Heaven.
Ever to do ill will be our sole delight,
Reassembling our afflicted powers
On the burning Lake of liquid fire.
Hail horrours! Hail infernal World!
Here at last we shall be free!