In "Scholar Walking in the Night" Lee Soo Hyuk found out the truth that Shim Chang Min was the vulgar teacher.

On the 9th episode of MBC Wednesday/Thursday drama "Scholar Walking in the Night" broadcast on August 5th, Yang Sun (played by Lee Yoo Bi) made a false revelation that he was the vulgar teacher. This was in order to save her father (played by Jung Kyu Soo) and She Son (played by Shim Chang Min) as she lied and said that she was the vulgar teacher.

Afterwards, Se Son felt a pang of conscience and went to the place where his father had died. Seeing this, Kwi (played by Lee Soo Hyuk) thought he was wrong. At this time, he found a person that was keeping the side of Hyun Jo (played by Lee Soon Jae). He called him into an underground tunnel and said, "Why are you there? Are you watching Se Son? Are you protecting him?" Soo Hae was surprised and said, "I'm actually the offspring of the vulgar teacher. Just save me." With that, he said what he knew.

Kwi was angered. He said, "Does the king also know about this fact?" With that, he killed the servant right away.