"Penthouse 3" starring Lee Ji Ah, Eugene, Kim So Yeon, Uhm Ki Joon, and more gave viewers another jaw-dropping revelation in episode 4.

With the SBS drama creating a massive buzz on social media, the Friday series surprisingly had a slight dip in its viewership rating.

"Penthouse 3" Viewership Rating Slightly Decreased but Remained as Most Watched Drama

According to Nielsen Korea, "Penthouse 3" episode 4 viewership ratings garnered an average nationwide rating of 14.9, 17, and 17.1 percent for its three parts.

Although there has been a minor change in percentage ratings, the thriller crime drama still holds the top spot as the most-watched program last Friday and most-watched miniseries for the entire week.

READ MORE: 'Penthouse 3' Consistent as No. 1 on Weekly Wave Drama Chart

"Penthouse 3" Episode 4 Highlights: Oh Yoon Hee Knew Joo Dan Tae Killed Joo Hye In

As Oh Yoon Hee (Eugene) continued to track Shim Su Ryeon's biological children, she was surprised to hear that it was Joo Dan Tae (Uhm Ki Joon) who was the prime suspect of killing Kim Mi Sook.

However, she was baffled why Yoo Dong Pil (Park Ho San) took the blame and went to prison for six years instead of Dan Tae.

She then barged into Dong Pil's work at the Hera Palace and insisted that it was the vicious chairman who killed Mi Sook and not him. Surprisingly, he warned Yoon Hee to keep her mouth shut if she didn't want to end up dead like Mi Sook.

At a distance, Dan Tae is watching the two argue and immediately asks Secretary Jo (Kim Dong Kyu) to investigate Yoo Dong Pil and Yoon Hee.

Bae Ro Na and Joo Seok Hoon Save Ha Eun Byul from Ms. Jin Bun Hong

Bae Ro Na (Kim Hyun Soo) confronted Ha Eun Byul (Choi Ye Bin) about the cheating incident regarding the admission to Seoul National University; however, Ms. Jin followed Eun Byul and dragged her out of the ladies room.

As she was leaving the room, she mouthed "help me" to Bae Ro Na. right then and there, she sensed that something was not right.

Ro Na then asked Joo Seok Hoon (Kim Young Dae) to help her.

To rescue Eun Byul, they staged a commotion to get her out of Ms. Jin's sight.

Interestingly, the duo asked Eun Byul to hide at Ro Na's house.

Ms. Jin, on the other hand, knew that Ro Na and Seok Hoon are keeping Eun Byul away from her and with this, she is eager to find what she calls "her daughter."

At Ro Na's house, Eun Byul told her that Ms. Jin became obsessive towards her. She then asked Eun Byul to call her mom Cheon Seo Jin (Kim So Yeon) and asked her to pick her up.

However, the former primadonna knows that Eun Byul is her weakness and will only hinder her from getting back at Joo Dan Tae. she then told her daughter to stay with Ms. Jin.

Of course, this broke her heart, and thought that Cheon Seo Jin did not care for her at all.

Unfortunately, with the help of Joo Seok Kyung (Han Ji Hyun,) Jin Bun Hong tracked Eun Byul and abducted her.

At the parking lot, Oh Yoo Hee followed Ms. Jin's car after seeing that Seo Jin's daughter was in the back seat and unconscious.

Before the car chase and trying to save Eun Byul, she called Shim Su Ryeon and told her that she had to learn about something and asked to wait for her.

Shortly after that call, Yoon Hee mentioned Eun Byul's situation with Ms. Jin.Shim Su Ryeon together with Cheon Seo Jin followed Oh Yoo Hee in hopes to save Eun Byul.

Joo Dan Tae Gets the Upper Hand Over Eugene

As for Jin Bun Hong, she tried to ask help from Dan Tae but fell into his trap and was abducted by his men.

'Penthouse 3' episode 4 featured how Joo Dan Tae is desperate to keep Oh Yoon Hee from telling people his secret.

At the scene, he saw Ro Na's mother trying to escape with the unconscious Eun Byul.

At the height of her intense car chase with Joo Dan Tae, she attempted to tell Shim Su Ryeon that her biological daughter was alive and it's Joo Seok Kyung.

Near the cliff, Joo Dan Tae tried to push Yoon Hee's car and even placed a stone on the accelerator after hearing a mobile car, but before this, he stole the genetic test paper in Oh Yoon Hee's bag.

Meanwhile, she was blocking the car with her whole body to save Eun Byul. "Penthouse 3" episode 4 hints that the two died after falling off the cliff.

IN CASE YOU MISSED: 'Penthouse 3' Star Eugene Shares Why She Almost Ditched the Top-Rating K-Drama

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Written by Geca Wills