ATEEZ(에이티즈) 티즈는 80살

In the Korean comments

One comment identifies the video’s sharp turn, in translation: “You make us laugh for the whole 30 minutes, then make us cry for the final three. I’ll love you for another 80 years. Thank you too.”

What the words mean

막내 (maknae, the youngest member) literally identifies the group’s youngest person, but it also remains a fixed idol-group role as everyone ages. That familiar, affectionate usage is why Jong Ho becoming the “old youngest member” is the punchline.