After getting their hair and makeup done at the shop, the BTOB members headed towards the 2018 Kpop World Festa. Likewise, the Red Velvet members are also ready and on their way.

Sungjae supported his back as he got off the van.

Eunkwang: Ya, is your back still hurting?

Sungjae: Just a little bit, I couldn't move when I slept last night, so it's not in a very good condition

Minhyuk: Then take it easy on the dancing Sungjae-ah

Sungjae: Alright hyung, I'll be more careful

Meanwhile the Red Velvet members are first up for their rehearsal on stage. BTOB watched from the backstage as they are up next. Sungjae's eyes naturally landed on Joy, he didn't see anyone else, he smiled proudly as he watched Joy sing and dance. Red Velvet's rehearsal has ended and BTOB is up next. As they passed by each other, Sungjae and Joy's eyes met. Sungjae winked at Joy, and for a brief moment, Joy's heart melted, but she was careful not to let anyone notice, and walked away with a poker face. Although his back ached, Sungjae successfully completed his rehearsals with BTOB on stage and returned to their waiting rooms.

At the same time, Joy was resting in Red Velvet's waiting room, when she saw something next to her phone that wasn't there when she left her phone here. It almost seemed like someone had deliberately placed it there. She picked it up and flipped it over. It was a photo, taken this very morning, when Sungjae walked out of the Red Velvet dorm. Joy quickly hid the photo into her pocket and rushed to BTOB's waiting room. She made sure no one saw her, then opened to door to go in. Right at that moment, Sungjae was groaning about his aching back, but his face lit up as soon as he saw Joy.

Changsub: Oh? Sooyoung-ah

Sungjae: You came?

Joy: Oppa what's wrong? Is your back okay? Does it hurt??

Sungjae: Just a little bit, it's nothing, why did you come? Is it because you missed me? *Smiled cheekily*

Joy: Oppa... *Trembling voice*

Sungjae then noticed that Joy's hands were trembling, and her face was pale. 

Sungjae: Ya, Sooyoung-ah, did something happen? Why do you look so freaked out...? 

Joy: Oppa... this... It wasn't there when I left, but when I got back, it was next to my phone... I don't know who put it there, but whoever did, knows... 

Joy pulled out the photo from her pocket and handed it to Sungjae. Sungjae clenched his fists and crumpled the photo. He threw it onto the floor out of anger and took a deep breath. He then took a step forward and held Joy's hand in his and tried to comfort her. He put his arms around her and held her to stop her from shaking.

Sungjae: It's okay... It's okay... I'll find whoever did this, and I won't let that person go so easily... I'm gonna...

Joy: Oppa... Do you realize what this means... This means this person already knows about us, and this person has been watching us... This person could be watching us right now, this person was in my waiting room... This person could be someone we know and trust oppa... What are we going to do...

Sungjae: But no one even knows... I haven't told anyone... 

Joy: Oppa... we might have to avoid meeting for the time being...

Sungjae: No!!! I can't do that, not again... We'll catch the person, think closely, who else could possibly know about u