On the 21st, 'Unanswered Questions' will probe the true face of Kim So-young, who committed a series of murders at a motel in Gangbuk.

On Jan. 29, a man in his 20s, Kim Su-hyeok (pseudonym), was found dead at a motel in Gangbuk District, Seoul. And just 12 days later, on Feb. 10, another man in his 20s, Choi Young-min (pseudonym), was found cold and lifeless at another motel 1 km away.

"They said he died while alone. My younger sibling had no illnesses and was healthy, so I thought it was strange." - second deceased, the late Choi Young-min (pseudonym)

Autopsy results showed excessive amounts of benzodiazepine-class drugs, a type of psychotropic medication, in the bodies of both deceased. In just over ten days at a Gangbuk motel, two men died in similar ways. CCTV confirmed the person who entered the motel with the men the day before, and surprisingly it was the same individual.

One month after her arrest, the suspect's identity was revealed as 20-year-old woman Kim So-young. She is believed to have given hangover remedies laced with preprepared drugs to cause two deaths and render four people unconscious over four months. She even showed nonchalance by leaving the motel with delivery food while the men who had lost consciousness were left unattended.

Kim So-young said she only sedated the men with psychiatric medication prescribed to avoid unwanted physical contact and did not expect them to die. Is her claim true? It was even revealed that Kim So-young carried out the second murder while she had been notified to appear for police questioning over the earlier incident.

"I also passed out when I met her. I had a little to drink, and suddenly everything went white in front of my eyes..." - Kim So-young's ex-boyfriend

Numerous tips arrived from people who met her, including an ex-boyfriend who dated Kim So-young for three months. Kim So-young, whose lax behavior during the crimes raised questions, was diagnosed as a psychopath in a psychological test. What is her real face, which contrasts with the beautifully packaged image on social media?

The bereaved families of the two deceased, who are most eager to know Kim So-young's motive, stood before the camera for the first time. The producers obtained the phone of the first deceased, which even the police could not unlock, and restored the sealed records. What were the bizarre and shocking messages Kim So-young sent to the first deceased?

On the 21st at 11:10 p.m., SBS' Unanswered Questions will reveal Kim So-young's bizarre acts in detail.

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