LU4US (루커스), formerly known as LU:KUS (2014–2016; 2019–2020 and L.A.U (2016–2019), is a four-member boy group under JWK Entertainment.

Originally, LU:KUS consisted of J.ONE (leader), Donghyun, Kyungjin, Choi, and maknae Jinwan. They were formed in 2013 by Box Media but were shortly re-located to PAN Entertainment and officially debuted on July 4, 2014 with the digital single "So Into U". The group left PAN in 2016 and changed their name to "L.A.U" due to their previous agency holding the rights to the name. They changed their name to "LU4US" in January 2019 after signing with JWK Entertainment. However the group continued to use their original name "LU:KUS" alongside their new name until the former was disused sometime in late 2020.

On March 7, 2020, Haewon announced that he would be retiring from being an idol.

On June 24, 2020, the group announced the addition of new member Jong Hyo, former member of CIRCUS CRAZY and LC9.

On June 15, 2021, Kyungjin announced through his Instagram that he was leaving the group to focus on solo activities. In July of 2022, the group announced that Kyungjin had decided to return to activities with LU:KUS, reverting to being a 4-member group. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.