While Hae-soo is still in shock over Jae-yeol's cavalier attitude toward moving back into his old place, she finds him heading out with a bag of clothes.
He explains that since the construction noise can't be heard after dark, he'll spend the night in his house. Hae-soo tentatively asks when he'll be back, only to get a shrug from Jae-yeol in return-if his work goes well, it could be a few days. Then, just like that, he leaves.
Hae-soo calls him in a huff later to ask where he is, and whether he has anything to say to her. "Yeah, I do," he replies. "Sleep well." Click.Even if she is not happy about his behavior, she can't help but miss him.
Two days pass without Hae-soo getting a call from Jae-yeol, which has left her pretty exasperated. Jae-yeol, on the other hand, is looking a little rough around the edges and unshaven, even though he can't help but smile as he remembers kissing Hae-soo on the couch in his living room.
He debates on whether to call Hae-soo with his finger hovering over the button, but eventually decides against it. Hae-soo is left to wander forlornly in his room at her house, and finds a note he left with the code (the flight number from their Okinawa trip) to his locked bathroom, as a way of opening himself up fully to her.
"Now there is no such thing as my private space. You can come in whenever," the note reads. "But... when are you ever going to tell me that you love me, Ji Hae-soo?" After reading it she lies in his bed/bathtub, lost in thought.
At the prison, Sunbae Jo administers the truth serum to Jae-bum, who's a little miffed at the idea that even if he's able to prove that he was telling the truth about Jae-yeol's involvement, nothing from the session would be permissible in court.
But he still relents to the drug, shrugging that he wants to try it anyway because he doesn't trust himself anymore to know whether the memories he has are real or not.
Jae-yeol has a talk with PD Choi about featuring Jae-bum on his program-and even though PD Choi claims it's suspicious that Jae-bum keeps implicating him as the true culprit, Jae-yeol claims it's more suspicious that the prosecution was able to put his brother away for eleven years without solid evidence.
"I beg you. Clear my brother's name from this crime. If you can do that for me, you'll have my respect," Jae-yeol says. "Also... stop coming around Hae-soo." Huh, well that's maybe not the best way to go about asking for a favor.
PD Choi gets on his high horse about how he won't leave Hae-soo's side until he's positive that Jae-yeol isn't dangerous, and warns him not to get too close to Hae-soo. "What are you going to do if I've gotten very close to her?" Jae-yeol retorts, prompting PD Choi to grab his arm violently as he asks if they slept together.
When Jae-yeol tries to just shake him off peacefully, PD Choi punches him in the face. Then he throws another punch, even after Jae-yeol tells him that they should just stop right now, forcing Jae-yeol to fight back in order to defend himself. But he overestimates his strength when he sends PD Choi flying into a stack of crates, knocking him out cold.
Jae-bum takes Sunbae Jo on a journey through his truth-serum-induced memories to the soothing sounds of electrorock. His jealousy of Mama Ok-ja's favoritism when it came to his little brother over him becomes clear, as does his disdain for the way Jae-yeol would get beaten by their stepfather.
He remembers trying to defend his brother against his stepfather that fateful night, by throwing the oil he'd bought for Mama Ok-ja on him and threatening to set him on fire. But somehow their stepfather got the upper hand, and started beating the daylights out of Jae-bum while Jae-yeol watched.
That's when Jae-yeol grabbed the knife, and how their stepfather was stabbed. Jae-bum was the one to pull their stepfather off Jae-yeol (since he'd sort of "fallen" onto the knife and his little brother), leading to the bits of flashback we've seen where Jae-bum took the knife out.
