I'm so thankful if you read this, really!

I can't seem to find a story, and I don't know the name anymore... I really really want to read it again, so bad!

It's a banghim story. I think it has seven or eight chapters. It's about Yongguk asking Himchan out for seven days (I think) and every chapter is a day (I think). Everything goes nice and Himchan falls in love with Yongguk, but after those seven days Yongguk breaks up with Himchan on the beach, because the seven days he had promised were over. Then it turns out Yongguk had cancer and he had been in love with Himchan in high school but Himchan always learned and Yongguk was a popular kid... then Himchan says he doesn't want to break up and they both die on the beach. 

Does anyone know what's the name of the story? If you do, please tell me! I'll give you a reward! Like a poster, a story, ... anything you want! Please, I just ask for the link to the story because it was so, so awesome and I really want to read it again.

Thank you so much for reading this, even when you don't know this story. It meant you still wanted to be some help to me. I can't thank you all enough!! Really! THANK YOU!!!