As her battle against Noh Seok Min (Kim Tae Hoon) continued, Do Do Hee (Kim Yoo Jung) discovered a devastating truth about her past in "My Demon" episode 13.

'My Demon' Episode 13: Jung Gu Won Investigates More About Do Do Hee's Parents

The episode started with Madam Ju's confession about witnessing the devil. She mentioned how the devil possessed her.

Meanwhile, back to the present, Jung Gu Won and Do Do Hee spent time together after the performance. She learned about the demon's past life as a human and how he killed himself. Upon knowing this, she embraced Gu Won and felt sorry for his past.

The following day Gu Won asked for advice from God so he could avoid the past tragedy with Do Hee. And the important thing he heard from her was, "Happiness can also be poisonous."

Back home, Do Do Hee and Jung Gu Won had romantic moments again together.

However, her mood changed when she saw an accident that brought back memories of her parents.

To know more about it, Jung Gu Won asked Seok Hoon about Do Do Hee's background.

Later on, Do Hee opened up about Madam Ju and how devastated she was when she died.

Noh Seok Min Implements His Own Rules

In the office, Noh Suk Min scrapped the rules implemented by his mother and established his laws. His wife, on the other hand, was still sick about the sudden death of their son.

Jung Gu Won and Do Do Hee spent their first Christmas together as a couple and created more memories together. Apart from them, the relationship between Park Bok Gyu and Secretary Da Jeong is thriving and they try their best to keep their romance a secret.

Ga Young was seen leaving Jung Gu Won as she realized her wrongdoings and wished to move on from her feelings.

Elsewhere, Seok Min invited Do Do Hee to a family dinner in which he planned to bridge the gap between them.

Somewhere else, Jung Gu Won rushed to make a deal with a gambler so that he wouldn't combust in flames. But his followers witnessed the entire scene and discovered his identity. They became more of his fans.

Back at Seok Min's house, his wife, Se Ra, found the book on demons and was caught by her husband.

That same night, Jung Gu Won and Do Do Hee attended the family dinner and it ended in disaster. Seok Min asked everyone to transfer their shares to him, but everyone said no to his deal, this made him angry, and stopped being kind to them.

Ju Seok Hoon learned of Seok Min's changed behavior in the company and confronted him, but he got kicked out as the CEO instead.

Do Do Hee Learns Shocking Truth About Madam Ju

Jung Gu Won, on the other hand, decided to get back the demon manual book and headed to Se Ra at the hospital where Seok Min kept his wife as a prisoner. Gu Won told her to tell the truth about the book's location so she could escape.

While the demon was there, Do Hee learned about what Seok Min did to Seok Hoon and confronted him. She then figured out that Seok Min was the mastermind behind his son and mother's deaths.

Seok Min acknowledged everything and revealed how Madam Ju was the mastermind behind Do Do Hee's parents' death.

As proof, he even showed a voice recording proving Madam Ju's fight with Do Hee's parents. But she refused to believe such a thing, and Seok Min suddenly choked her, planning to kill her next.

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Shai Collins wrote this.