Yujin never understood the meaning of love. 

So she kept on wondering; what does love feels like, how does it happen to a person, or when do they usually occur?

She asked lots of people. Suddenly it feels like she's doing a research paper. 

The answers they gave her were unclear. She can't really grasp the thought they are giving. 

Maybe she's a person who can't feel anything? 

Turns out she's not. 

Because the moment she laid her eyes on Wonyoung, everything became clear in an instant. 

Like a crystal, her feelings with Wonyoung... It's solid. Transparent. 

Now she understands. 

So this is love.