 On February 25, 2017 Sung-hoon celebrated his birthday party with 3,000 fans at KBS Arena Hall.On May 28, Sung-hoon held small fan meeting "Back to the songs, Back to you" with 1,300 fans to celebrated his solo debut 16th anniversary at Bluesquare, Samsung Card Hall.On January 1, 2019, Sung-hoon released a statement via his official fan cafe that he had agreed with YG to terminate his contract as of December 31, 2018 and left Sechs Kies.