Yoon Sanha 윤산하 is Astro's maknae and lead vocal.
Sanha was born on Tuesday, March 21, 2000, in Seoul.
He was born in the Chinese Year of the Dragon and his zodiac star sign is Aries. He's 181 cm or 5'11½" tall. His blood type is AB.
He attended Hanlim Multi Arts High School with Rocky. He also went to Baegwoon Middle School. Before that, he attended A-Sound Music Academy, where he took vocal classes.
He became a Fantagio trainee on December 16, 2012.
He's not only the maknae in Astro but at home, too; he has three older brothers. His father and brothers taught him to play the guitar.
His hobbies are eating, reading, and dancing. His nickname is "Beagle." He has a pure, innocent personality. He's Christian. He's allergic to seafood and he says that he can't drink coffee because it makes him too hyperactive. His favorite color is pink and his shoe size is 260. His role model is Busker Busker. He has a flexible body; he can fit into a bag or a cupboard. He can't blow bubbles when he chews gum. He has the most aegyo in the group.
In 2015, he was in Fantagio’s web drama 투비컨티뉴드 “To Be Continued,” where he had his first kiss.