In "Bluebird House" Bang Eun exposed the truth about Chae Soo Bin's birth to Jung Jae Soon.
On the 32nd episode of KBS drama "Bluebird House" broadcast on June 7th, Lee Jin Yi (played by Jung Jae Soon) understood the secret of the birth behind Han Eun Soo (played by Chae Soo Bin).
On this day, Lee Jin Yi started to pick on Park Haeng Sook (played by Bang Eun Hee) and compared her to Han Sun Hee (played by Choi Myung Hee). Park Haeng Sook was upset and in her fury, she said that Han Eun Soo wasn't the birth daughter of Kim Sang Joon (played by Kim Jung Hak).
Park Haeng Sook said, "How is Eun Soo related to Sang Joon? She's not even related to Sang Joon by blood" as she grumbled. Lee Jin Yi said, "Eun Soo isn't Sang Joon's kid? You just said that now. If not, you stare at me in the eyes and you say something."
In addition, Lee Jin Yi said, "I've felt that you were a bit weird recently. Why are you like this to Eun Soo?" In the end, Park Haeng Sook confessed the truth and said, "It's not even her own child. It's a child that has no relevance to her or Sang Joon."