Ha Sung-woon announced his own song 'Do not forget' through various online music sites at 6 pm on the 28th.
Ha Sung-woon's own song 'Do not forget' entered Naver Music No. 1, Bucks No. 3, Melon No. 6, and Genie No. 6 at 7 pm.
'Do not forget' is a lyrical melody, a sweet voice of Ha Sung-woon, and Park Ji-hoon, who was with Wanna One, participated in the feature and improved the perfection of the song.
Ha Sung-woon has worked on 'Do not forget' during Wanna One activities, and mentioned that there was a song made before making 'Fireworks' among the songs on Wanna One album through the portal site Naver V app.