I just checked, and I'm pretty sure the rest of the cast members aren't listed because they're not in the database here at MDL. 

The other cast members I could find:
Kim Do Wan as Ji Eun Woo
Kim Doo Ri as Lee Seul Bi
Kang Yool (naver profile) as Han Hae Sung
Shin Joo Hyeob as Ha Joon

Feel free to add them so they show up :)  Not much info about any of them though.  (all cast info from naver)