<Korean TV Series NOW> ”Buried Heart” EP4, Park Hyung Sik loses his memory = Viewership rating 10.2%, Synopsis and spoilers

*This article contains spoilers. In EP4 of the SBS TV series "Buried Heart" (viewership rating: 10.2%), Dong-ju (Park Hyung-sik) appears to have lost his memory.
Driving in the dark and torrential rain, Dong-ju felt extremely anxious and ended up in a traffic accident, falling into the sea. When Dong-ju woke up a while later, he saw a floating figure on the shore.
It was Wonbae (Lee YooJun) who took the designer watch from Dongju, who was in a car accident. Dongju had lost all of his memories and was unsure whether his current situation was a dream or reality.
Meanwhile, Jangseon (Heo Junho) and Ildo (Lee Hae Yeong) are faced with a crisis due to Dongju's disappearance. Dongju has been hiding his "Patriotic Fund," a secret political fund of 2 trillion won in its account.
Janseon, who realized that he had hacked the bank account, pressured Ildo to pay him 2 trillion won on the pretext of Dongju's murder. In order to get the money to give to Janseon, Ildo went to Daesan Group's Cha
He tried to open the chairman's (Woo hyun) safe but was frustrated because he didn't know the password. He called the only number left on his cell phone. He found Eun-nam (Hong Hwa Yeon)
Hee-chul (Kwon Soo-hyeon), Dong-ju's husband, answers the phone and expresses his anger when he recognizes Dong-ju's voice. This is conveyed to Il-do. After a while, the phone rings again and Dong-ju
Il-do, hearing Dong-ju's voice, repeated, "You've come back, Dong-ju." Jan-seon was happy that Dong-ju was alive. Jan-seon said, "I can finally get my hands on the 2 trillion won."
He was so excited by the thought that he immediately sent Il-do and Gu-ho (Choo Young Woo), who acts as his hands and feet, to Dong-ju. At the same time, he had no choice but to tell Dong-ju the password he had hacked.
He also prepared a torture chamber to hold the body of the suspect. However, unlike Janseon's expectations, Dong-ju was not so easy to catch. Instead, Dong-ju rescued Il-do who had fallen into the water, but Il-do was found guilty of murder.
Worried that Dong-ju might be killed, he let him go. After escaping from Jansung's grip, Dong-ju headed to Seoul to search for clues in the tuxedo he was wearing.
Dong-ju arrives at a tuxedo store and happens to see his beloved Eun-nam and her husband Hee-chul.