Taeyeon live with his little brother, himchan in a piece village located in Jeju Island. Losing their parents in such a young age, Taeyeon took the responsibility as omma and appa for her little brother, the only family she has. meanwhile Himchan, who is really talented in songwriting as well as playing his favourite guitar does not dream to be a singer as he really doesn't like boyband until he is being introduce by her senior, Donghae to an underground music band called SUNSHINE. Since then, his dream to become a singer become more clearer day by day. although he look happy and cheerful with his sister, Himchan really is a heartwarming boy with innocent and naive mind. one thing that he want to keep secret with her sister is his first love, Yoo In A, a noona he met during high school but never meet again after that. although he is known as the hottest boy and playboy (by his noona), he still hope to have a chance with his crush, Yoo In A. 

Lee Donghae. a senior of Himchan during high school is really close with his hubae since their school-time. Become the son of the big shot person in one of the biggest shipping company in Seoul, he never show it in front of people around him. At first, he really want to be close with Himchan since he have a crush with Taeyeon but realizing the talent that Himchan have, he decided to help him pursuing his talent and showing it to the people by introducing SUNSHINE to his junior. 

" Promise me..noona, don't leave me alone"

something happen... and definetly change their live completely. is their beutiful live will continue until the end?

"is i have lose you, Himchan-ah?"

" I got almost every day..is a secret angel is really exist?" Himchan look at his fellow member, Yongguk while holding a fans-letter named Secret Angel thightly.

a story abot love, dream and hope. there are always a rainbow after the rain, but is it just easily as like that?

" that singer.....is my dongsaeng..." she's mumbling, looking at the screen. Donghae hold her hand tightly, looking the beautiful hazel eyes in front of him, completely dropping his heart.

"It is okay..as long as i have you, there are no other thing that i deserve more...."