On January 31 KST, S.M.ROOKIES made an exciting announcement via their official social media account. Through handwritten letters, S.M.ROOKIES members Kun, Lucas, and Jungwoo - a.k.a Lucky 3 People - announced that they're finally making their official debut by joining NCT.

SEE ALSO: S.M.ROOKIES drop gorgeous video of new members Hendery, Xiao Jun, and Yangyang

The rookies thanked fans for the great support and for waiting for them, and also expressed excitement at their new beginning.

Meanwhile, NCT released a video titled '2018 Yearbook' on the same day. Many assume the boy group is gearing up for their comeback. Will Kun, Lucas, and Jungwoo be joining the impending comeback? 

Stay tuned for updates!

#JUNGWOO #데뷔 #축하 #Lucky3people #NCT #SMROOKIES #에스엠루키즈 pic.twitter.com/bwSDEh2PcY

— SMROOKIES (@smrookies) January 30, 2018

#LUCAS #데뷔 #축하 #Lucky3people #NCT #SMROOKIES #에스엠루키즈 pic.twitter.com/MlooQAbH4z

— SMROOKIES (@smrookies) January 30, 2018

#KUN #데뷔 #축하 #Lucky3people #NCT #SMROOKIES #에스엠루키즈 pic.twitter.com/UqsnLoPBry

— SMROOKIES (@smrookies) January 30, 2018