Kwon Jiyong has been Sandara Park's archenemy since Kindergarten. This epithet, however, begins to change when they both enter college and Dara realizes that Jiyong's life is "not everything is as it seems". 

Foreshadowing is presented in the form of a novel, Ambiguity, that the pair are studying in class,  and how the main protagonists of the novel, Naomi and Ace, parallel the actions and feelings of them both....

Ambiguity makes people feel wronged
they can't find evidence of love
the right time to get closer, the right time to give up
Can't even bring up the courage to hug one another

I can only accompany you up to here
After all, there are some things that I cannot do
Surpassing friendship, not quite reaching love
It's about to rain in a faraway place

Should I cry?
Is it you or I who thinks too much?
I'm really not convinced and I start to suspect
Is the person in front of me really the same you?

Ambiguity makes people feel wronged
they can't find evidence of love
the right time to get closer, the right time to give up
Can't even bring up the courage to hug one another

Ambiguity makes people greedy
until waiting loses its meaning
I cannot bear the fact that we cannot write out an ending
Let the beauty of regret stop right here