@eunluci If you think about it, a lot of comments are pointing out how it’s bad for her health. But it also shows that Mizi is not acting how Sua views her. To her, Mizi would never pick up an unhealthy or toxic habit. Because Sua views Mizi in a pure light, but never a realistic one.
This scene in particular stands out to me. When idols smoke or drink, it's treated as scandalous and it's something that 'defiles' their image. Mizi smoking should in a casual setting with her girlfriend should be no issue, but Sua gets upset, because it is also ruining her--
one time i asked this girl out and she said "i'm actually not dating right now because i'm pretty sure i'm going to die at 27" and then she pulled out a white lighter and lit a cigarette.