"No matter what happened between me and you 
I'll always be the girl that you could run to 
I loved you then I love you now and forever 
Cause you're my sunset-set-set-set-set-set" 

- Sunset by Marques Houston

After a harsh heartbreak, Mark Tuan becomes a cold-hearted person— but she meets Kim Hyejin, who turns out to be more promising than what he sees.