TWICE 11th Anniversary Celebration

In the Korean comments

One comment adds unusually specific context: in translation, “This is the first time we’ve reached October 20 without a new song.” The commenter says that the fan party and all nine members celebrating together kept this from feeling disappointing, even as some members move to different agencies. Another turns the anniversary into an image worth carrying into the video: in translation, “The nine stars came together over 11 years to make one Milky Way in ONCE’s hearts.”

What the words mean

트둥이 (Teudungi, TWICE cuties) combines TWICE’s Korean name with 귀염둥이 (gwiyeomdungi, cutie). Here it is not another group or person, but a casual, affectionate nickname for the TWICE members collectively.