In "Bluebird House" the person who had the key was Chae Soo Bin in the end.
On the 46th episode of KBS weekend drama "Bluebird House" broadcast on July 26th, it turned out that Jung Ae (played by Kim Hye Sun) refused for her daughter. Jung Ae was the birth mother of Eun Soo (played by Chae Soo Bin) and she refused to testify falsely for the benefit of Tae Soo (played by Chun Ho Jin). This was for her daughter, showing that she too had maternal instincts.
A while before this had happened, Tae Soo had put Jung Ae as collateral next to Ji Wan (played by Lee Joon Hyuk). While Tae Soo had been nominated to be the "Ethical Businessman of the Year" Ji Wan told Jung Ae that this was their chance to let the world know about Tae Soo's bad deeds. He said, "This will be more efficient and expedient than going through an official trial process." At this, Jung Ae said, "Yeah that's fine. That's why I'm here anyway. But then again, there's no chance that I'm going to jail or something right?" With that, she received confirmation from Ji Wan that nothing would be happening to her.
