In 2018, Choi was cast in his first lead role on network television in the 2-episode drama special Exit. He was then cast in the romantic comedy drama So I Married an Anti-fan as the male lead, based on the webtoon of the same name.
On March 7, 2018, it was confirmed by Huayi Brothers that Choi has been in a relationship with actress Park Shin-hye since late 2017.