'Thank You' unveiled the preview for the upcoming special with Lee Hyori, Yenny, and Lee Ji Yeon sharing behind-the-scenes stories from their many years in the business. 

After filming the special, Hyori shared on her Twitter, "I returned home after finishing filming for 'Thank You' today... I was so crazy busy these days, so it was really a meaningful time.. Lee Ji Yeon sunbaenim's soy bean paste stew was the best... I was happy listening to Yenny's beautiful singing... I'm thankful for Cha In Pyo oppa's friendly MCing... Thank you, everyone."

Yenny replied, "Hyori unni~ It's Yenny! I am very thankful that you invited me yesterday. ^^ I felt and learned a lot..! It was really a happy day! I'll always cheer you on!^^."

Hyori replied, "Okay, Yenny. You did well, and like right now, don't forget you and do well~ I will watch over you."

Fans were touched by their sweet exchange and commented, "It's nice to see their friendship," "Lee Hyori and Yenny are both charming," and "I can't wait to see this episode."

Stay tuned for this episode on the 31st! 
 

[Thanks to everyone who sent this in!]