In 2017, Jung Gun-joo signed an exclusive contract with JYP Entertainment and made an appearance in DAY6's music video "I Like You".

[1] In 2019, Jung joined Blossom Entertainment and acted as one of the main cast of Extraordinary You.

[2] Jung served in the mandatory military service at the age of 21 during his university days.

And he has a barista license based on his experience working part-time at a coffee shop.

[3] Before becoming an actor, Jung studied mechanical engineering and modeled to earn pocket money.