According to Hankyung.com on July 6th, Choa sang the theme song of Park Do Kyum in the KBS 2TVŌĆÖs To All The Guys Who Loved Me. Previously, Choa left her group AOA in June 2017. This will be her return to the music scene after three years. The producer of the OST for the drama confirmed that Choa participated in singing the OST. The full song was first revealed during the August 3rd broadcast of the drama. This song will depict the lonely emotions that Park Do Kyum feels after his breakup. Since the singer sounded like Choa, the OST caused a buzz in online communities and social media. Choa, the oldest member and main vocal of AOA, received love for her energy-filled voice. Though she was active in multiple variety shows with her signature lively personality, she took a sudden break from her activities. At the time, her agency revealed that Choa would have a hard time with her continuing promotions due to depression and insomnia. Welcome back, Choa! Source (1, 2)
