Top definition
the name of one of BEAST/B2ST members...a new k-pop ban from cube ent. JYP's sister management group. Their first appereance as a group was in october 2009.

Yo seop is a blonde hair,talented,inoccente cute guy with an amazing voice♥
YoSeop oppa is so mine!! he looks like G-Dragon's lil bro...oww
by stumpidapirna January 11, 2010
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