fun and believed he brought the character to life. Shin elaborated: " [...] my generation doesn't really know him as a Winner [member] [...] I didn't have any bias because of the group he was in, he just fit well with us." The series also served as an on-screen reunion for he and Krystal since five years and six months in High Kick: Revenge of the Short Legged (2011–2012). Kang and band-mate Mino released its soundtrack titled "Door" (문; mun). In 2018, he lent his voice for the Korean film Golden Slumber (2018) and its eponymous soundtrack originally by The Beatles. Paul McCartney received $200,000 for its usage, highest for a Korean production. 2020–present: King of Mask Singer and first full-length album In March 2020, Kang was invited by the MBC singing competition program, King of Mask Singer, for the second time and subsequently won, earning the title as the "122nd Mask King" during his appearance as "Chow Yun-fat" after defeating South Korean singer, So Chan-whee. He pulled off six consecutive wins and was named "The First 6-Time Idol Champion" and “The Youngest Champion” at the time. "Chow Yun-fat" was credited for its rise in viewership ratings in which recorded 10% since his first stage. His appearance maintained double digits in rating which placed the show on top within its time slot for five consecutive weeks. Kang's performances placed number-one and two respectively every week on the Naver TV Top 100 Popular Video Chart while his alias topped real-time on search portal site Naver in the entirety of his reign of 14 weeks hence created a buzz. Kang returned as an actor after three years since Prison Playbook (2017–2018) with Kairos (2020). He joined its main cast as "Im Gun-wook", and was often filmed with Lee Se-young and Lee Joo-myung. His persona earned a nomination at the 2020 MBC Drama Awards for "Best New Actor". He joined the fourth season of Voice (2021), a thriller-procedural series, and acted as "Han Woo-joo", the 4D patrol officer that was specially recruited in the cyber team. In request by the series', he sang the soundtracks "Can You Hear Me" and "Your Voice" for both aforementioned projects. Kang released his first full-length album on March 29, 2021 — ten years into his career as a musician — entitled Page and its lead single "Iyah" (아이야; aiya). The album debuted at number three on the