if anyone is confused of why she was waiting:

so basically this 'girl' is a lover of hoseok. he died, so she griefs over it by sending drafts of text messages to his old phone. she is not a stalker btw lol.

she wants him to come back because she loves him. when she says: your not picking up your phone, she means as how she's lonely without him, because they talk a lot on the phone.

when she goes to see his grave, she searches for it at the graveyard. she stole her parents' car to go.

welp.