Jonghyun and Jaeyeon were the best couple known.

They were the most compatible couple in the school. In other words, they were the couple made in heaven.

Jonghyun was also the sweetest boyfriend of the century.

He could give up everything for Jaeyeon and he wanted everything that was the best for Jaeyeon.

What will happen if he suddenly realized that his vision would be gone soon, and he would no longer be able to see Jaeyeon's smiles anymore?

What will happen if he decides to risk himself for an operation that only has a 50% chance of success?

And when Jaeyeon knew about everything last minute, imagine the pain and devastation that she would be put through while waiting for him.

Its undescribeable, yet she believes that Jonghyun would be able to pull through that moment.

And she believes that he would be able to wake up to see her once again.

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"I'm sorry to tell you but, you would only have 3 months of vision left. But there's an operation,

you can change for a new cornea with this. But there'd be a high risk for this operation.

Because its near your brain, it may actually affect your vital organs.

There's a 50-50 chance of success and failure in this operation."

"I'll do it, despite the high risk. I understand that." 

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"Goodbye is such a tough word to say. To think of it, it’s easy,

but when I have to do it, it would be so hard."

"And I don’t think I would ever want to bid farewell to you

because saying Goodbye is probably the hardest word in

the world that I can ever say to you."