"Chief Detective 1958" Episode 4 focused on the team's new mission, with Lee Je Hoon and Lee Dong Hwi taking the lead.

After successfully wrapping up their first mission, the Jongnam Police Investigation Unit 1 took on an unexpected case.

Based on the iconic 1971 K-drama "Chief Inspector," the MBC series depicts the story of the hotshot detective, Park Young Han, before his fame as a cop.

Played by Lee Je Hoon, the "Chief Detective 1958" cast includes Lee Dong Hwi as Young Han's right-hand Kim Sang Soon, along with the rookie detectives Cho Kyung Hwan and Seo Ho Jeong, played by Choi Woo Sung and Yoon Hyun Soo.

Their mission is to bring back peace and orderliness in Jongnam by punishing perpetrators and abusers.

'Chief Detective 1958' Episode 4 Rating: Series Sees Huge Decrease

After soaring to its all-time high, "Chief Detective 1958" Episode 4 experienced a major slump in ratings.

In a report, the April 27 broadcast garnered an average nationwide rating of 7.1 percent, a significant decrease from its previous episode of 10.8 percent in Episode 3.

'Chief Detective 1958' Episode 4 Recap: The Case of the Mysterious Orphanage

Following their first achievement as a group, Jongnam Police Investigation Unit 1 had an unexpected case. A young mother visited the police station, hoping that someone would help her find her missing baby.

However, a member of unit 2 wanted to take the case to a different station, but the mother pleaded with the officer to help her locate her baby.

Kim Sang Soon, who heard the mother's request, gladly listened to her and agreed to look into the case.

READ MORE: Lee Je Hoon K-Dramas to Watch While Waiting For 'Chief Detective 1958' Premiere

After an initial investigation, the team found out that the mother last saw her 5-month-old son while they were having their afternoon nap. Upon waking up, she was surprised that her son was nowhere near her side.

The investigation unit team 1 ruled out that there might be a syndicate behind this after newspapers mentioned that 10 babies were found dead. With the help of two rookie detectives, they gathered a series of significant pieces of information, pointing them to a possible lead.

The team, especially Kim Sang Soon, was suspicious about a certain Audrey Ko, who was running an orphanage. She refused to cooperate with the team after Park Young Han asked if they could do a background check as part of their investigation, which she denied.

However, this didn't stop the team from getting more information.

Interestingly, an orphan revealed to Kim Sang Soon that he saw around 10 babies in the basement and being taken care of by director Yoon.

Things changed when Audrey Ko got furious after finding out that the babies have "defects," which make them "unsellable" to those parents looking for children.

Just when Audrey Ko thought that the women's commissioner would be on her side, the witness revealed that she had an accident after breaking the gas fumes in the basement that caused the infants to suffocate.

The women's commissioner saw that Audrey Ko had a cut on her hand, which made her believe the witness.

Park Young Han and Kim Sang Soon delivered the unfortunate news to the mother after finding the swaddle that she made for her baby in the orphanage's trash can.

Meanwhile, Kim Sang Hoon was having mixed feelings about their recent case. He was happy that they were able to capture Audrey Ko but failed to save 10 babies.

The episode also hinted at Sung Hoon's background story. The reason he was invested in the case is because he also grew up in an orphanage.

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Written by Geca Flores