Each of the members were asked to go around and give their final remarks on appearing as guests of 'Haechan Radio'. When it came Jaemin's turn, he said,
"Uh... first, I had a great time being on the radio program of such a famous, and retarded... and well-known, and smart DJ, our Sun-D, everyone... and I hope that everyone will continue to love our Dreamies' new album and 'Ridin'' until the end, and I'll wrap it up here."
The word choice in Jaemin's comment which stirred up controversy was the word "저능" (pronounced "jeo-neung"), which translates to "having lower mental capability compared to an average person, either born with such a condition or developing it through an illness". The word can considered similar to the denigrating English term, "retarded".
In addition to the controversial word choice of his speech, the incident also garnered mixed reactions from netizens due to the members' immediate reactions. Most of the members burst into laughter when Jaemin paused momentarily after saying "Jeo-neung", while DJ Haechan jokingly made a sad face.
While it seems that among the NCT Dream members, the word choice was taken as a joke in light of carrying out a fun and lighthearted broadcast, some netizens still expressed their discomfort with the term. Those who felt offended by Jaemin's word choice took to Twitter to trend the hashtag, #DREAMAPOLOGIZE.
You can catch Jaemin's final comments of the radio program in the full clip below (~28:14 mark).