Lee Dong Yeol, formerly known professionally as Xiao, is a South Korean singer, dancer and member of UP10TION (업텐션). He graduated from Hanlim Entertainment Arts High School and is enrolled in the Broadcasting and Entertainment program at Global Cyber University.

He made his debut in September 2015 as the group's lead dancer, vocalist and maknae with their first EP, "Top Secret". They are managed by TOP Media (티오피미디어).

In March 2023, the agency announced he was parting ways as his contract had expired, and he decided not to renew it, but he remained part of the group.

In July 2023, he signed with PA Entertainment (PA엔터테인먼트). He made his debut as a solo artist (under his real name) in May 2024 with the single album "Howling".