Is it just me or when the phone rings ost especially see the light, like it has a mysterious thing to it? Like it makes me feel things I swear.. It is so dauntingly beautiful attractive and really suit the theme of the drama. 

Does anyone agree with me? 

No you are not only one the ost is really vibes with the show and leads. It is mysterious and hauntingly beautiful. Generally tbh for me Kdrama osts sound same esp in romcoms but there are few which stand this has that. Last time felt this was My Demon OST 'True'.

Yes, i 100% agree with u on this, i also really love the ost true too in My Demon.