*Still on the Original Timeline Flashback, 2015.*

"Oh, wow. Yunju. You know this loser from our school?" Soomin giggled.

"Loser? Are you talking to yourself?" Yunju replied.

"What? You know her? You go to a different school." Sunwoo asked.

"She used to go to my  Gangnam High. But she was expelled for being caught cheating multiple times." Yunju answered.

"You bitch." Soomin said. 

Soomin walked towards Yunju and pulled her hair.

Yunju pulled Soomin's hair.

"STOP!" Sunwoo shouted and pushed Soomin away.

"You guys. Never mess with me again." Soomin said aggressively and walked away.

"Are you okay?" Sunwoo asked.

"Yes." Yunju answered.

"Here's an Ice Pop. to cool you down." Sunwoo said and handed over a Blue Ice Pop to Yunju. and to himself.

*Back to the present timeline*

"This is.. I'm going insane." Sunwoo said.

"What? I think i need to go now. I'm gonna meet my mom after years. Yunju asked.

"Wait.. Didn't you say you never met your mother and doesn't even know what she look like?" Sunwoo asked.

"Here you go again. We don't know each other. And I never said that. Yes, It's been a while since I saw my Mom because we moved to America. but of course I know what she looks like." Yunju replied.

"Didn't she say in the football game.. In another timeline, that she doesn't even know what her mother looks like?" Sunwoo thought to himself.

He realized that his acts changed the timeline. Butterfly Effect. He changed Yunju's fate. From never meeting her mom, to raising her at a young age.

"Sunwoo. I gotta go now." Yunju walked away. 

"This is.. Crazy. I've known Yunju before College? Why didn't she act like we know each other then?" Sunwoo said.

Sunwoo is finally uncovering what happened in the Original Timeline during the time skipped through years. He is replaying what happened after He felt Deja Vu.

*Back to the Original Timeline Flashback, 2015.*

After a few weeks. Sunwoo and Yunju hanged out more often.

After School, they always ride bikes around the town.

"Wanna get drinks after school?" Doyoon asked. 

"No, Sorry. I got plans with someone." Sunwoo answered.

Doyoon gave him a blank stare. 

"Really?? Who is this someone you always hang out with everyday?" Doyoon asked.

"That's a secret." Sunwoo answered and gave him a thumbs up.

"Uh." 

Every day, Sunwoo and Yunju ate together, studied together, hanged out despite going to different schools. Yunju treated Sunwoo as if they were more than friends.

One day, Sunwoo came to Study with Yunju at the library. 

"Now. Are you free today?" Doyoon asked.

"Nope. Not today." Sunwoo answered.

"Again?? Where are you going? It's my sister's birthday. We're having dinner tonight. Wanna come?"

"Sorry bro. I'm going to the library today."

Sunwoo walked into the library and looked for Yunju.

He spotted Yunju and sat with her. 

Sunwoo brought out a Coffee.

"Heree you go." 

"You didn't have to but, Thanks! Why are you here?" Yunju asked.

"I wasn't doing anything at home. And you told me last night that you would come to the library. So I decided to go." Sunwoo answered.

They spent hours discussing about books and finally went home. 

"I'll go with you. It's dark already. You can't go like this alone." Sunwoo said and held Yunju's hands.

"No. I swear it's okay. I'll wear a cap and shades. That will scare people away." Yunju smiled and walked away.

Yunju took the last train.

Yunju stepped in the train as the door closed.

She was wearing earphones, looking through the window.

It was dead silent. She was alone. 

Soomin walked towards Yunju, holding a pocket knife. 

Yunju couldn't hear because of the earphones.

Soomin stabbed Yunju. 

Coincidentally, Doyoon was in the same train just as he was going home after the dinner.

"Hey!" Doyoon ran to Soomin and pushed her away. 

"You.." Soomin raised her knife and chased Doyoon.

"Run!!" Doyoon shouted to the girl with the cap. Not knowing it was Yunju. She also doesn't know who Yunju is.

Yunju walked slowly as she was holding her stomach. Bleeding excessively.

Doyoon punched Soomin.

Soomin passed out.

"Are you okay?" Doyoon asked Yunju.

"Y-yes." Yunju answered.

"No you're not. Let me bring you to the hosp-"

"No. I said I'm fine. I can't let him know this happened. He will worry alot." Yunju answered and immediately left after arriving. 

"What is up with her." Doyoon said.

Soomin escaped and never showed herself after that.