He wasn't well, and she didn't understand why. He was supposed to be happy, they both were. After that day, but he's not. He was sick. But what can she do? They're no longer a part of each other's life.

So what had happened after Jonghyun and Tia became a couple?

To Jonghyun, she was the most beautiful person in the world and no one could ever take his heart except her. It's a shame she's Key's girlfriend.