In the basement under the fine hotel, Baek-Hyun and the rest of the gang, wich are 5 members, have found out Saja is somehow connected to Park Chul.
"We must have a talk with Saja. Come on." Baek Hyun says, while guiding them to the cars. Its more normal to have 2 black cars pulling jp infront of a libary than a group of 6 persons on black and neon colored bikes.

Inside the libary, they finds a boy like Saja.
"Hello, what are your name ? Baek-Hyun asks him.
"Saja, Park Saja. He answers and the gang smirks.
"Can we please talk somewhere private ?" Ji Hye's maid Mina asks Saja.
"Uh yeah, we can talk in the conference room, but there are some video cameras." Saja guides them to the room when Mina asks him something again.
"Does the cameras records sound ?
"Uh, no.
"Good", was everyones thought.
The group ends up finding out that Park Chul has 3 sons, and a daughter. Normally the daughter would be the heir because she is the oldest but she lives in USA with her boyfriend. So they have 33,33% chance of killing the right heir, but then the next oldest would just become and so on. But then the police would get aware of it. So they had to wither kill them all at the same time, or kill the one who would be most dangerous in that company.
While the group is getting info out of Saja, Minas phone rings.
"I'll be back in a minute." She goes out but come kn quickly.
"We have a problem." The whole gang turns their heads at her for explaining but she is already finding the car keys, so the others just follows her out while giving side eyes to Saja.

The two cars speeds away while Mina tells them what she got called about.
"Ji Hye and that  skinny boy is at the hospital, they got hit by a truck, and all of the books they sended pictures of is nowhere to be found."
The rest of the ride is awfully quiet.

As soon as they reach the hospital, they finds a doctor to tell them the room Ji Hye and Saem is in. The group barges through the door just to see the two persons laying in their beds, totally pale and a lot of blood on them.

A doctor walks into the room with some notes.
"Hello, I'm doctor Kim Daeyang, Ji Hye's personally doctor. She and the boy had crashed into a truck while riding back from a libary.
I have run some tests, to check their health. They should wake up in some hours. I'll let you be here alone, call me if there is needed something.

~2 hours later, 5pm~
The whole gang is dazed of when they hear a little voice. The skinny boy is awake. His head isnt so damadged so they can ask him some questions about what happened.

~1 hour later~
While Saem was telling them what happened, they hear a little hoarse voice. All of them looks up to see their queen slowly opening her eyes.

Ji-Hye and Saem waits some hours to get some extra checks before they can take home.
While driving home, Ji Hye asks what they found out.
"Well, we now knows Park Chul 3 sons that can br the heirs, because the daughter is in the US with her boyfriend. While discussing it, Mina gets a phone call. She hangs up and looks seriously at them.
"Do you remember Park Shi-Woo ? The man who worked with us last year to solve a case of a dead russian mafia ?
...
He's Park Chuls son."
Everyone stares at Mina.
"What do you meam? So the man who have helped mafias is also son of Park Chul wich is absolutely against maffia ?" Ji Hye recieves a nod as answer.
"This case is getting weird." Baek-Hyun speaks.
"You wanna know whats weirder?" Everyones head turns towards Mina.
"There is a post on Park Chuls's instagramprofile with pictures of all the books you found." Mina looks towards Ji Hye and Saem."