Ma Jin Young, known professionally as Jin.O, is a South Korean singer, dancer and member of A.CIAN (에이션).

He made his debut (using the stage name Jung Sang) in October 2014 as A.CIAN's new leader and lead vocalist. The group debuted in September 2012, but Wings Entertainment (윙즈 엔터테인먼트; formerly known as ISS Entertainment) began making several lineup changes, so he was added for the promotion of the single album "Ouch".

The group has not officially disbanded but has not released any new music since 2016 and is listed "on hiatus" by their company since 2020.

He enlisted for his mandatory military service in February 2019 and was discharged in late 2020.

He promotes as a solo artist and also does busking alongside group mate Seo Seung Hyun (now known professionally as Seo Woon Yul).

(Source: kisskh) Edit Biography