From May to July 2019, Leeteuk hosted a Thailand-based variety show, "Beauty No.9", which focused on Korean beauty products. His hosting act was well received by the locals and media. In August 2019, it was announced that Leeteuk is set to publish a cookbook, which was targeted for single-person households and he became the first idol to publish a cookbook. It was published on January 20, 2020. On September 12, 2019, he hosted "Idol Star Athletics Championships (ISAC) 2019" alongside Jun Hyun-moo and Twice's Dahyun.