First Name: Jung Hwan
Family Name: Lee
Native name: 산들
Also Known as: 이정환; Lee Jeong Hwan;
Nationality: South Korean
Gender: Male
Born: March 20, 1992

Lee Jung Hwan, better known by his stage name Sandeul, is a South Korean idol and the main vocalist of boy band "B1A4". He made a debut on the stage of "MBC Show! Music Core" on April 23, 2011. He has been part of five Korean mini albums, three Korean studio albums, and two Japanese studio albums. Sandeul was known to have competed in numerous singing contests prior to training and debut. Sandeul was approached by a company agent after performing a song by Kim Yeon Woo in a talent show. He then underwent a training period of two years.