i have a theory between the two songs 'siren' by Taeyeon (2022) and Sunmi (2018).
Siren (by Taeyeon) is the prequel to Siren (by Sunmi).
same title
alarm sound (mostly) at the end of Siren and at the beginning and during Siren: continuity
mentions of the danger of the Siren (in both songs/both are dangerous) but Siren is warning about it, while it's too late already in Siren
while Siren is saying she won't (can't) let go while they're 'both' hurting, Siren is warning to let go because she will only get 'him' ('Boy') hurt
'잔인한 fantasy 널 구원할 듯 해치는' (A cruel fantasy that harms you as if it will save you) in Siren and '니 환상에 아름다운 나는 없어' (There is no beautiful me in your fantasy) in Siren
more stuff the lyrics but not precisely actually, but as a whole and i already wrote a lot so i'm not gonna post the whole lyrics of both songs, or at least not here and rn but if you want check and compare
in Siren 's mv, we can see that the siren is the danger. she's like a coping mechanism so she won't get hurt when love is here again, like before: in Siren(?) (which doesn't have a mv so i can't compare it-)
at the beginning of Siren, both the adlibs and the choreo conveys a sense of calling / 'I can hear the siren' in Siren: the call of the one she will (be forced to) become in the future, because of the pain (Siren's calling/a siren)
PS: this theory was approved by a (non-kpop fan) irl friend