Jeong In Seong is a South Korean singer, dancer, musical actor, and member of KNK. He graduated from Korea Arts High School, focusing in Music. Before debuting, he spent several years as a trainee at Big Hit Entertainment and FNC Entertainment. After arriving at YNB Entertainment, he appeared in music videos of their label mate, Bestie, and performed as backup dancers for the girl group.

He made his debut in 2016 as the group's main vocalist with a debut showcase and the release of their 1st single, "Knock". In 2017, all group members at the time entered the singing survival competition "MIX NINE" and he ranked 26th overall but had to leave before the show ended to continue with the group's promotions in Japan. A year later, it was announced that KNK and YNB Entertainment ended their contract and that the members were planning on continuing the group with another agency.

In early 2019, they signed with 220 Entertainment and had several tours in the US and in Europe. In 2020, they released their 3rd EP "KNK Airline" and afterwards, lineup changes and mandatory military enlistments have caused the group to nearly stop promoting for the time being. He debuted as an actor with a minor role in "20th Century Boy and Girl" in 2017 and had the lead role in the musical "All Eyes On Me".

He enlisted in his mandatory military service on February 8, 2022 and was discharged on August 7, 2023.

(Source: Korean = NamuWiki || Translation = MyDramaList) Edit Biography