Lee Hoe-taek (Korean: 이회택; born August 28, 1993), better known as Hui (후이), is a South Korean singer, songwriter and composer. He debuted as the leader, main vocalist and lead dancer of boy group Pentagon in October 2016, under Cube Entertainment. He was a member of the co-ed trio Triple H, alongside former bandmate Dawn and former labelmate Hyuna, and is the leader of trot boy group Super Five of MBC's Favorite Entertainment. He is also well known for his participation in the reality competition series Boys Planet, where he placed 13th overall.

Hui participates in writing and producing a majority of Pentagon's songs. Some of his best-known works are Wanna One's "Energetic", Nation's Son's "Never", Produce X 101's "Boyness", JO1's "Oh-Eh-Oh", and Pentagon's "Shine", "Naughty Boy", and "Daisy".

At Pentagon's debut showcase, Hui explained the meaning behind his name: believing Lee Hoe-taek, his real name, is difficult to pronounce (particularly for foreigners), he settled on Hui as a mononym. During a stay in China, he discovered local people pronounce the first syllable of his name, Hoe/Hwe, as "Hui/Hwee", which inspired his decision.

Hui was born on August 28, 1993, in Gwacheon, Gyeonggi-do Province, South Korea. In 2012, Hui graduated from Modern K Academy. On Comedian Singer Producer, Hui confessed that he was rejected from Hanyang University. He lived in Beijing, China for eight months before joining Cube in 2013.

Hui used to be a JYP trainee before joining Cube Entertainment. In 2010, he won first place on Best Male Vocal at JYP 7th Audition Final Round. In 2013, Hui was preparing to debut in China. He failed to make the cut into Chinese Idol as he was placed 60th and immediately dropped out from the show. In an open audition in 2013, after leaving JYP, he was the only participant selected by all three entertainment agencies (Cube, Sonic Music and Nega Network). In December 2013, Hui danced at the KBS Festival and danced to the special stage of Son Dong-woon and Kwon So-hyun. In 2014, Hui appeared in G.NA's "Secret" music video and promotional activities. He also appeared in Rain's "Rain Effect" as a trainee, and received advice from Rain about debut. Hui spent about six years as a trainee before debuting with Pentagon. In February 2015, Hui was part of a vocal project group, Seorin-dong Children (서린동 아이들) with Jinho and another female singer. They released a remake of Lee Won-jin [ko] and Ryu Keum-deok's 1994 classic "For All the New Lovers". The group wasn't supposed to consist of them, but after the three recorded the guide, Cube's Artist Development team decided to release it.

On October 10, 2016, Hui made his official debut as a member of Pentagon through 2016 Mnet's reality show Pentagon Maker and becoming the leader of the group. He made a cameo on the web drama Spark.

On April 4, 2017, Cube Entertainment announced that he would participate in a project group called Triple H alongside Hyuna and E'dawn and that they would star in a reality show called Triple H Fun Agency. The group debuted on May 1 with the EP 199X and title track "365 Fresh".

In 2017, Hui co-composed the Produce 101 season 2 hit song, "Never" and Wanna One's debut single, "Energetic" alongside Flow Blow which won by public votes on which song they'd like to see for the group's debut single. Both songs achieved an all-kill on Instiz, charting at No. 1 on real-time charts of Melon, Mnet, Bugs, Genie, Soribada, and Naver.