Heck you right. I straight up got chills
Btw the song (at least the one I listened to) is Anything Goes by Cole Porter
I just looked it up and the one reccomended in the webtoon was by Frank Sinatra but it's actually a cover of Porter's song. They're the same song but both have a very different feel to them. The one by Porter gives me very much Midnight by Ray Noble from the Shinning vibes, while the Sinatra one feels much more romantic. I think they are both good but I believe the 1930's gramaphone sound of the Porter version gives a much more creepy experience because it sounds much more happy (and old) than romantic.
Porter version: https://youtu.be/r7NJ9ylAhos
Sinatra version: https://youtu.be/nT2gpRZYL8U
thank you for put the Porter version in the comment! although i enjoyed it i guess i still prefer the unique voice of Sinatra ahaha
for putting*
reading the last part of chapter 6 listening to the song they mention is just an another level experience