Melody Day appeared on 'Yoo Hee Yeol's Sketchbook' this week!

The girls revealed that they've been so active in OSTs and project activities that they have over 20 OSTs and over 50 songs total when adding duets and singles.  They did a medley of their OSTs, receiving great applause from the audience afterwards.

SEE ALSO: Melody Day reveals only 3 of the 4 members will be on 'The Unit'

The members then introduced their individual charms with Cha Hee revealing her mature voice to be her charm.  Yeo Eun said, "I did pansori (traditional singing) when I was young, so I often hear that I have a deeply sorrowful voice, but I can naturally change it to voice for everything from R&B to musicals."