Red Velvet's Joy lends her voice for another beautiful OST.

The idol star is currently playing her very first lead role in the drama 'The Liar and His Lover'. She also recently dropped the MV for her first OST ever titled ''Yeowooya''. She once again sang an OST for the drama; this time with her co-star Lee Hyun Woo.

Check out the beautiful OST ''I'm Ok'' in the new MV.