On the March 26th episode of Happy Together, actors Taecyeon, Chun Jung Myung and actresses Moon Geun Young and Seo Woo appeared on the show to promote their upcoming KBS drama Cinderella's Sister. Unfortunately, Seo Woo has been receiving criticism for some rude behavior displayed during the broadcasting. While Moon Geun Young talked about the drama, Seo Woo was gossiping with Taecyeon. Then she laughed at an inappropriate moment, causing MC Park Myung Soo to scold her saying, "You look bad if you laugh inappropriately while a person is talking." When Chun Jung Myung was about to share an experience during his military service, Seo Woo said to Moon Geun Young, "Look, he's telling his army story again." Viewers commented on her behavior saying, "She looked like she had no manners whatsoever," and "If you've got something to say, you should wait until the other person is done talking." Whether or not these were just innocent mistakes or flat out rude behavior is not anyone's place to judge. However, many fans were disappointed by the way she acted on the show so perhaps she will watch her step the next time she makes a public appearance on a program.