On the October 3rd episode of MBC's 'Radio Star', INFINITE's L and the leading cast of�MBC's new sitcom 'What Is Mom' guest starred on the show.

The cast members hilariously revealed that they had at first confused L with the comedian Park Myung Soo.

As L had only been known by his stage name, the actors had automatically assumed Kim Myung Soo (L's real name) to refer to the comedian Park Myung Soo, and was in for a surprise when they realized there was quite a difference between Kim Myung Soo and Park Myung Soo.

Actor Ryu Seung Soo shared, "To be honest, at first I thought that I would be filming alongside Park Myung Soo, and was pretty satisfied with the casting [as it is a sitcom]." Kim Seo Hyung added, "My stylist also thought that Park Myung Soo was acting [for this production]", bringing laughter on set.

In other news, 'What Is Mom' will premiere on October 8th!