[3] As a solo singer, he has released two albums: Stand Alone (2006) and Another Corner (2008), and three extended plays: Mark (2012), Word (2014), and Polygon (2017).

Dong Qn attracted substantial audience attention from his appearance on a popular South Korean singing competition TV program I Am a Singer (Season 3, aired in 2015).

In 2016, Ha Dong Qn founded the independent record label Mark Planet, under which he then released his new mini album Polygon, consisting of five single tracks, on May 11, 2017.

Getting rave reviews for his new album, he held a very successful first solo concert Night: The First on June 4, 2017, and continued advancing his career by participating in a variety of popular music events, such as the Someday Festival in Seoul, the Yoo Jae-ha Music Contest, and several benefit performances for people in need.

He released single named "그때 우린" on April 18, 2019, declaring the news of a soon-to be-released new album.