Lee Je Hoon found out about the truth regarding the secret document and as Kim Tae Hoon became the prime suspect, this added tension to the drama.
On the 8th episode of SBS Monday/Tuesday drama "Secret Door" (script Yoon Sun Joo, director Kim Hyung Shik), Lee Sun (played by Lee Je Hoon) found an illegal book of Park Moon Soo (played by Lee Won Jong).
Lee Sun was looking in the illegal book and looked at the phrase that Shin Heung Bok (played by Suh Joon Young) had said was particularly interesting. In that process, he brought the book closer to the candlelight and saw words even clearer.
In that place was none other than the content of the secret document. Lee Sun called in Park Moon Soo and asked whether he was related to the Shin Heung Bok incident. Park Moon Soo confessed that his hands had been involved with the corpse of Shin Heung Bok.
Meanwhile, SBS Monday/Tuesday drama "Secret Door" is a period drama tha follows the conflict between King Yeongjo (played by Han Suk Kyu) and Crown Prince Sado (played by Lee Je Hoon). Kim Yeong Jo has an authoritarian ruling style whereas Crown Prince Sado insists on equality for all.
