Potato bomb killer Yoon Ji-on was killed in 2018, and in 2020 Jun Ji-hyun flew a drone looking for Ju Ji-hoon.
The 5th episode of TVN's Saturday Drama Jirisan (played by Kim Eun-hee/directed by Lee Eung-bok and Park So-hyun) broadcast on November 6 revealed the criminal in the potato bomb case.
The Seoi River (Jun Ji-hyun) found out that the man with the wound on the back of the hand of the potato bomb that Ju Ji-hoon saw in the illusion was Lee Se-ok (Yoon Ji-on). Lee Se-ok is a person who loses his father and lives in a relative Lee Yang-sun (Resident Kyung) house and makes beekeeping in the mountains. However, Seoigang did not fully believe the words of the gang hyun and did not believe that Lee Se-ok was a potato bomb.
In the meantime, the ship disappeared, and the Seoi River and the gang hyun found the ship in the mountains. The ship found a potato bomb alone and shed tears and said, "I wanted to believe my grandfather." The potato bomb was found in the hatch of the grandfather of the grandfather. Lee heard Lee Se-ok's words and found the hatch of the grandfather.
However, gang hyun was convinced that Lee Se-ok was the perpetrator when he saw the wound on his hand, and Seo-gang advised Lee Yang-sun to go to the police. Lee Yang-sun's grandfather was arrested by the police, but Gang hunjo visited Lee Se-ok and recognized the "black T-shirt with white stains" that Ahn Il-byeong said. gang hyun visited Anil Byeong and showed him a picture of Lee Se-ok, and Anil Byeong said that Lee Se-ok was the one who gave him the poisonous yogurt.
gang hyun searched all the unmanned cameras to reveal that Lee Se-ok was the criminal, and soon found a screen of Lee Se-ok carrying a potato bomb by searching the unmanned cameras together with the Sheer River, the Jeong Gu-young (Oh Jeong-se-min), and Park Il-hae (Jo Han-cheol). They contacted the police, and Seoi River noticed that Lee Se-ok had deliberately told his grandfather's story about Lee Yang-sun.
In the meantime, Lee Se-ok exchanged text messages with the person behind him and proceeded with the original plan as he instructed. As the Seoi River guessed, Lee Se-ok tried to kill the transfer ship with a potato bomb and changed the method to poisonous yogurt. Lee Se-ok handed over yogurt to comfort the transfer ship, and the transfer ship fell down on yogurt. But soon the Seoi River, Gang hunjo, and Jeong Gu-young were taken to the hospital where they found the fallen ship.
The Seoi River and the gang hyun felt popular and chased Lee Se-ok, who fled to the mountain. The Seoi River apologized to gang hyun, saying, "You were right. You saved your life." In the meantime, Lee Se-ok, who fled to the mountain, was found dead, and around him, Cho Dae-jin (Sung Dong-il) was found to be Fade to Black and raised suspicion.