I don't understand the symbology.
What does the red line represent? I'm having trouble parallelizing it to anything one might actually go through in real life.
The red line represents following your heart? Hmm, but wouldn't you know you are following your heart while you are doing it? Yet the character seemed unaware of what the line meant up until the very end.
My best guess would be the red line represents the natural flow of ordinary coincidences that ultimately, by remote chances, bring you to the one person you meet. Most relationships, including friendships, happen this way, such that any change in the timeline could change who you grow up to know and become friends or partners with.
But I'm having my doubts on this interpretation.
What were you trying to express through the red line symbol?
10 since I cannot base my rating on a lack of understanding or over-questioning that perhaps only I have. And I'm sure you'd appreciate a 10. :)
Thanks.