Sol next starred in a 2019 film "Idol" opposite Han Suk-kyu and Chun Woo-hee, which opened in March. Despite the solid acting by three senior actors, "Idol" received mix reviews. In April 2019, Sol reunited with Jeon Do-yeon, eighteen years after "I Wish I Had a Wife", in the film "Birthday". The film, inspired by the Sinking of MV Sewol tragedy, deals with the struggles faced by a couple who lose their son in a tragic accident. The film had its international premiere at the 2019 Far East Film Festival in Udine. The same year, Sol starred in the human comedy film "Man to Men" with Cho Jin-woong.