[Spoiler] "Drama Special - Jin Jin", is Shin So-yul the culprit?

Who is the sender of the threatening letter?

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Ha-jin (Yoon Jin-seo) thought the dead Yoo-jin (Shin So-yul) to be her own criminal, in the KBS 2TV drama special, "Drama Special - Jin Jin".

Yoo-jin and Ha-jin are friends from high school and Yoo-jin has always been a possessor of special feelings. To Ha-jin, she was one she didn't want to be close to. According to Ha-jin, Yoo-jin even made her thoughts her own.

In high school, Yoo-jin invited Tae-seok (Kim Da-hyeon), Kyeong-cheol (Lee Si-eon) and Ha-jin to a run-down building. They discussed how they would repay their teacher. Ha-jin was being sexually molested by her teacher and as a result, Kyeong-cheo and Ha-jin were furious.

The answer was to threaten the teacher with a letter. Ha-jin refused. Yoo-jin respected that and said nothing was ever discussed between them. However, there was a threatening letter on the teacher's desk and Kyeong-cheol confessed that he did it.

The problem was that this letter had caused a secret of the teacher's to come out and he had killed himself with the woman who he was in an affair with. She was Ha-jin's mother. Yoo-jin left a note to Ha-jin who was crying, "I'm sorry and I miss you".

She left the school and when she was reunited with her friends years later, she was killed.