[9] In 2014, Sung Hoon starred in the web drama 6 Persons Room, where he played a construction safety engineer who suffers an injury and finds himself in a hospital surrounded by strange patients.

[10] In 2015, Sung Hoon starred in the web drama Noble, My Love,[11] and featured in KBS's romantic comedy series Oh My Venus playing a professional MMA fighter.

[13] In 2016, Sung Hoon returned to the Korean small screen with KBS's weekend drama Five Enough, playing a model turned professional golfer, where his pairing with Shin Hye-sun gained popularity among the viewers.

[22][23] He was also cast in the sitcom, The Sound of Your Heart: Reboot,[24][25] as well as the romantic comedy web drama I Picked Up a Celebrity on the Street.

[26] In 2019, Sung Hoon returned to small screen with the romantic comedy drama Level Up playing a character of a company restructuring expert.

[27][28] By end of 2020, Sung Hoon returned to web drama with My Secret Star playing a character of a Hallyu star who is hiding a big secret and meets an entertainment journalist who risked her life to get on the scoop, played by Vietnamese actress Hoàng Yến Chibi.

[31] Sung Hoon became the first Korean actor to hold a fan meeting in Brazil and donate all of the proceeds to Brazilian flood victims.