1. Kwak Si-yang then appeared in the music drama, Persevere, Goo Hae-ra.

1. Kwak Si-yang then appeared in the music drama, Persevere, Goo Hae-ra.
Kwak Si-yang gained popularity after starring in the hit romantic comedy drama Oh My Ghost, portraying a chef who appears stand-offish but is kind and sweet.
Kwak Si-yang then starred in daily drama All is Well, and joined the reality show We Got Married where he was paired with actress Kim So-yeon.
In 2016, Kwak Si-yang starred in his first historical drama Mirror of the Witch.
Kwak Si-yang received his first major role in SBS's 2016 drama Second to Last Love, which won him the New Star Award at SBS Drama Awards.
Kwak Si-yang made a special appearance in KBS' romantic comedy drama Fight for My Way.
In 2018, Kwak Si-yang appeared in the thriller film The Witness, and in the romance thriller drama Four Men, a prequel to the 2017's Man to Man.
In 2019, Kwak Si-yang starred in the war film The Battle of Jangsari.
In 2021, Kwak Si-yang starred in the SBS historical-fantasy drama Lovers of the Red Sky.
Later in September 2021, Kwak Si-yang signed a contract with Drawing Entertainment after his contract with the previous agency has ended.
On September 20,2023, it was confirmed that Kwak Si-yang is in a relationship with actress Lim Hyeon-joo.