My name is Do Kyungsoo. People call me D.O for short. I am Kyung Mi's guardian angel and yet I failed to do the one thing that I dreamt of having accomplished the most. I failed to capture her heart.

Han Kyung Mi is now 21 and engaged to Kim Sunggyu. The two love birds are happily living on Earth while D.O has the job to scout for dangers. D.O roams the streets day and night, watching the two while his heart breaks. Kyungsoo sees her as a beautiful grown woman whom he has adored over the past years. But Kyung Mi only sees him as an older brother that takes care of her.

"I'm sorry, Kyungsoo... But I- I cant.. I love Sunggyu.." Kyung Mi swallows the painful lump in and Kyungsoo breaks into pieces right in front of her. A tear slips down her cheek before she knows it as Kyungsoo's warm hand cups her cheek to swipe the tear out of the way.

"Dont cry.. It's my turn to cry.." Kyungsoo says as the tears rush down his face.