Nam Ha Neul (Park Shin Hye) learned that Kyung Min was involved in Yeo Jeong Woo's (Park Hyung Sik) past in "Doctor Slump" Episode 12.

'Doctor Slump' Episode 12: Yeo Jeong Woo & Nam Ha Neul Harvest Fruit of Their Labor

Yeo Jeong Woo and Nam Ha Neul planned to treat their friends as they finally received their paychecks. However, Dae Young and Hong Ran were busy.

While on his way home, Jeong Woo was caught by Tae Seon and Ba Da and ended up getting drunk as they spent time together. He was surprised to wake up with Ha Neul's family by his side, eating breakfast. Ha Neul scolded him, but he was able to clean his mess.

Dae Young and Hong Ran, on the other hand, started to exchange a number coupon that they could use to help each other whenever they needed it.

Yeo Jeong Woo and Nam Ha Neul also gifted each other and went on a shopping trip to prepare for their field trip. He wanted to fulfill his girlfriend's dream.

While on the trip, the duo reminisced about their student years.

Dae Young & Jeong Woo Reminisce Med School

Ha Neul was surprised when Dae Young and Hong Ran arrived as they were invited by Jeong Woo. Ha Neul and Jeong Woo were suspicious of their friends' relationship but didn't bother to ask them anymore.

Dae Young and Jeong Woo then remembered their student years when Dae Young was jealous of Jeong Woo for being the top student and being the center of attention most of the time. The jealousy got him and they ended up fighting.

Jeong Woo felt bad and apologized to him.

Meanwhile, Dae Young mentioned his suspicion towards Kyung Min and how he once caught him with powdered medicine. Jeong Woo connected the dots with his spiked drink incident and understood that Kyung Min must have spiked his drink on impulse.

Nam Ha Neul Discovers Kyung Min's Involvement in Yeo Jeong Woo's Case

The following day, Ha Neul observed that something was wrong with Jeong Woo but didn't reveal anything.

Later, she went to meet her psychiatrist and saw a picture of a volunteering group with Kyung Min as one of the members. It made her suspicious and she asked Hong Ran to help look for the group members. She went to Hong Ran and asked her to meet the medical journalist.

Nam Ha Neul then discovered that the case manipulations that Kyung Min was playing might have been connected with Jeong Woo's surgery incident.

Later on, she received a call from her mom and headed to the police station where the policemen were asking Ba Da about the burglary incident that happened in Jeong Woo's house. Ha Neul recognized the man on the screen as Kyung Min.

She immediately went to him, and the two ended up having a confrontation in the car. She asked him about his involvement in Jeong Woo's case, which startled him and lost his focus on driving, and the two got into an accident.

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Shai Collins wrote this.