[Spoiler] "Secret Door" Han Suk-kyu's bone chilling dual personality

Yeong-jo (Han Suk-kyu) called his son Lee Seon (Lee Je-hoon) one day on the SBS drama "Secret Door".

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Yeong-jo confused Lee Seon by releasing Kang Seo-won (Jang Eun-poong), a likely criminal to a case, but was let go because he wasn't a good bait anymore.

Yeong-jo said to Lee Seon, "Take your hands off the case. You will hurt yourself. Leave it up to someone who's trustworthy. How's Park Moon-soo?"

Lee Seon carefully disobeyed his father and Yeong-jo said, "You are so stubborn. What have you learned so far?"

Lee Seon answered, "I'll answer that when I'm sure of it".

Yeong-jo added, "I am always on your side. You can tell me whenever you need help".

Meanwhile, the truth about Sin Heung-bok's (Seo Jun-young) death when he was in possession of the documents came to surface. Investigative results showed that he jumped to his death, but Lee Seon wasn't satisfied and asked for a second investigation. After Heo Jeong-hoon died as well, Lee Seon suspected the truth about the document based on Seo Ji-dam's (Kim You-jung) statement and started looking into the case himself.