Ji Chang-wook is a South Korean actor and singer. He rose to fame for playing the lead role of Dong-hae in daily drama series Smile Again (2010–2011), and has had notable lead roles in television series such as Warrior Baek Dong-soo (2011), Empress Ki (2013–2014), Healer (2014–2015), The K2 (2016), Suspicious Partner (2017), Melting Me Softly (2019), Backstreet Rookie (2020), Lovestruck in the City (2020–2021), The Sound of Magic (2022), If You Wish Upon Me (2022), The Worst of Evil (2023) and Welcome to Samdal-ri (2023–2024).

Smile Again is a 2010 South Korean daily television drama, starring Ji Chang-wook, Do Ji-won, Oh Ji-eun, Park Jung-ah and Lee Jang-woo. It aired on Korean Broadcasting System's premier channel KBS1 from October 4, 2010 to May 13, 2011 on Mondays to Fridays at 20:25 (KST) for 159 episodes.