In 2017, Cha starred in the romantic comedy Because I Love You, playing a gifted Composer who connects people in love; the film was again produced by his brother Cha Ji-hyun. He next starred in KBS2's variety-drama Hit the Top, which he also directs. The same year, Cha starred in the fantasy blockbuster Along With the Gods: The Two Worlds, based on the webtoon of the same name by Joo Ho-min, which was a huge success, becoming the second highest grossing film in South Korea.