Kim Min Seok, formerly known as Laun, is a South Korean singer, dancer, actor and former member of ONF (short for ON N' OFF). He graduated from Seoul Performing Arts High School, focusing on Practical Dance. Before debuting, he was a trainee at BigHit Entertainment alongside BTS. After switching companies, he was introduced as part of WM Boys with their first appearance as B1A4's backup dancers at the 2016 Dream Concert in Seoul and later, he gave a performance (alongside his fellow groupmates) at IDOLCON just a few months before debuting. He made his official debut in 2017 as member of both sub-units ON and main dancer, sub-vocalist and maknae of the group with their 1st EP "ON/OFF". Weeks later, he entered the survival competition "MIXNINE" and finished in 7th place, however, the companies could never reach an agreement and the project group that was planned after the show never got to debut. In 2018, the group signed a contract with Victor Entertainment and made their Japanese debut and held a concert in Tokyo. In 2019, he made his acting debut with a role in tvN's web drama "Chubby Romance 2" and later that year the company announced he was leaving the group due to personal circumstances that were never fully clarified. He opened his personal IG account in mid-2020 and has returned to using his birth name.