In "Scholar Walking in the Night" Lee Yoo Bi understood that Shim Chang Min was Se Son.

On the 9th episode of MBC Wednesday/Thursday drama "Scholar Walking in the Night" (script Jang Hyun Joo, director Lee Sung Joon) broadcast on August 5th, Lee Yoon (played by Shim Chang Min) saw Jo Yang Sun (played by Lee Yoo Bi) and other groups of the vulgar teacher house being demolished.

Lee Yoon was tormented by the fact that he couldn't reveal that he was the vulgar teacher. In front of him was his father Sadong Prince (played by Jang Seung Jo) and his ghost. He said, "Are you just going to watch those." With that, Jo Yang Sun wanted Lee Yoon's face. Jo Yang Sun was completely surprised to learn that Lee Yoon who he had known as an older person that had been helping him was actually Se Son.

Jo Yang Sun thought of the words form the prophet before. The words were that if Se Son was revealed to be the vulgar teacher, not only Se Son but many people would be suffering from death. In the end, Jo Yang Sun confessed falsely that he was the vulgar teacher even though he knew this was not true.