a handwritten letter in English to fans on November 26, 2016, and allowing them to upload the contents on her behalf. YG also revealed that Park and CL had signed solo contracts, hinting at the departure of Park Bom from the company. In 2017, Park became the host of OnStyle's beauty program Get It Beauty, alongside Honey Lee and Gugudan's Kim Se-jeong. Park then starred alongside Han Jae-suk in her domestic debut film One Step. Billed as the Korean remake of Begin Again, she portrayed Si-hyun, a convenience store part-timer who seeks out a mysterious melody she hears every night in her dreams, and meets the producer of an Internet broadcasting program who tries to help her find out the music. The film premiered in South Korea on April 6, 2017, and opened on May 10, in the Philippines. She received acting praise from its director, Jeon Jae-hong, who noted that she only had one retake during the filming process due to her professionalism. Park participated in another OnStyle project titled Relationship Appeal, where she reviewed trending topics and travel to popular tourist spots. Controversy arose when rude remarks directed at Park were made during MBC's SeMoBang: All Broadcasting in the World collaboration segment with Piki Pictures mobile variety team 'This is Real'. As the concept, the main characters were to "overhear" the constructive criticism of everyday netizens (picked by the 'This is Real' team) by separating the two groups with a thin wall. Viewers who watched the program criticized the teams selection and expressed discomfort with the remarks as they were believed to be personal attacks made in a subjective way. Piki Pictures issued an apology soon after and MBC deleted the video featuring the incident. Park closed the year by performing 2NE1's past hits in a solo headlining concert, one year after the band's disbandment. Park scored her first mainstream big screen role in the film adaption of the popular webtoon Cheese in the Trap as the heroine's best friend, Jang Bo-ra. The film premiered exclusively in CGV theatres on March 14, and placed among the top five at the weekend box office. This was followed by a leading role in an indie Vampire action film directed by Lee Won Jun, titled 107th Year of Night, which went on to win the category “Foreign Suspense Thriller Award” at the 2018 International Horror Hotel Festival for the Short Film