"Adamas" episode 15 introduces a surprising twist as Ji Sung finally found the murder weapon while Haesong has a new head.

As the action-crime series heads to its finale, September 13's episode had a slight dip in viewership rating.

'Adamas' Episode 15 Viewership Rating

According to Nielsen Korea, "Adamas" episode 15 sees a slight decrease from its previous episode after garnering an average nationwide rating of 2.869 percent, a minor drop at episode 14 of 2.958 percent.

Despite this, Ji Sung's drama is still the most watched Wednesday-Thursday series of the night.

'Adamas' Episode 15 Recap: Ha Woo Shin and Their Group Finds Team A's Hideout

The fifteenth episode began with the new group consisting of Choi Tae Sung, Lee Chang Woo, the twin's Ha Woo Shin and Song Soo Hyun finding the location where Team A disposes of the dead bodies.

In what looked like an abandoned place, they saw several barrels filled with cement and rotten bodies of the people that Haesong got rid of.

READ MORE: 'Adamas' Episode 14: Ji Sung Establishes New Group Against Haesong's Team A

While at the area, the group manages to find the "mission report" which is an essential part of their investigation to prove Haesong's illegal activities.

However, Prosecutor Song says it is admissible in court since the statute of limitations has ended.

Eager to find more clues, Choi Tae Sung pointed out that he should go after the main shareholders of AREs who were previously a part of Team A.

Fortunately, it led them to Team A's black site, which is said to be Haesong's former training institute.

Eun Hye Soo Takes Over Haesong

After receiving the surprising news about Chairman Kwon, his son, Kwon Hyun Jo, rushed over to the hospital and saw his father's lifeless body.

He believes that his wife, Eun Hye Soo was the person behind this and calls an emergency meeting with the management support department.

In "Adamas" episode 15, Mr. Lee, Team's A leader introduces the person who might run the whole conglomerate.

Eun Hye Soo meets with Haesong's management support department while Hyun Jo enters an empty conference room, signaling that he took orders from Hye Soo and not him.

Ha Woo Shin Finds the Adamas

One of the highlights of "Adamas" episode 15 is Ha Woo Shin's discovery of the Adamas.

The renowned writer figured out the possible connection between the gift that Song Soo Hyun received on his birthday, which is also the date where their step-father got murdered.

Ha Woo Shin saw that the Adamas was hidden in the action figure and one of Song Soo Hyun's most cherished possession.

After revealing this to his twin brother, he felt devastated and cheated by their biological father Lee Chang Woo.

Ha Woo Shin explained to Chang Woo that Song Soo Hyun blamed himself for the death of their step-father believing that he died to provide him his wish.

As Ha Woo Shin comforted his twin brother, Lee Chang Woo watched from afar, feeling guilty about his action.

From heartbreaking moments between the siblings, "Adamas" episode 15 showcases another twist and turn as Team A finds Lee Chang Woo's location.

Being outnumbered by Team A, Choi Tae Sung and the rest managed to find a secure place. He believes that one of them is the mule. Lo and behold, one of their colleagues points a gun at Ha Woo Shin. Lee Chang Woo attacked him, but he was killed along with the mule.

At this point, Ha Woo Shin was stunned to see his biological father lying on the ground.

On the other hand, SIH, along with Kim Seo Hee and Kang Hyuk Pil, came in to rescue. However, Ha Woo Shin and Kim Seo Hee believe that Song Soo Hyun is on the hunt for Team A's leader, Mr. Lee.

IN CASE YOU MISSED IT: 'Adamas' Episode 13: Ji Sung's Biological Father Exposes the Truth

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Written by Geca Wills