Kim Hee Sun, Taecyeon, and Ryu Seung Soo, actors from "Wonderful Days" made guest appearance on "Happy Together 3."

According to a KBS entertainment rep, Kim Hee Sun, Taecyeon, and Ryu Seung Soo attended the February 15th recording of KBS 2TV's "Happy Together 3."

This episode of "Happy Together 3" was a "Wonderful Days" special. Kim Hee Sun showed off her unstoppable witty conversation skills. Ryu Seung Soo, who's been known to have a great entertainment sense, contributed his wit as well. Even bright and lively Taecyeon participated in this successful recording. Unfortunately Lee Seo Jin was unable to join; he was in Spain to film tvN's "Grandpas Over Flowers."

This episode starring Kim Hee Sun, Taecyeon, and Ryu Seung Soo is scheduled to air on March 6th.