rainy day
A painful day
Horse boy
A place reserved for you.
You are so beautiful.
Figaro-The Nine Muses
Ugly -2ne 1
Escape.-Vision Wei
Ladder Kara
Roly poly t-ara
Bye, Valentine's Day.-Maybe
To tell the truth, what you said is not clear. At least tell me what TV series it is, so that you have no idea. These songs are very popular, sad and trendy in Korea, so you can listen to them. Everything is fine.
Dong Wenhua---"The Story of Spring"
Adu---"Spring in Hui'an"
Ren Xianqi---"Spring Flowers Will Bloo