While watching SBS drama ‘Oh! My Lady’ you can see main charactere Sang Minwoo often sing the same ballad song. On the 10th of may (yesterday), the Part 3 of Oh! My lady OST was released on online stores. The song is called 몾났죠 (motnatjyo / worthless*), lasts 2:12 and is Choi Siwon’s first OST solo song.
* 못나다 can be translated by various things thus hard to translate. I translated it by worthless but click to see the other possible meanings.