5 years ago......
"So where's your brother? Can i see him?" A guy asked.
"Yah! He's not my brother!" His girlfriend replied, her face showing a mixture of horror and disgust.
"Okay fine." He shrugged his shoulders.
"You can't see him, he died."
"Why are you so mean to him, the both of you have the same father."
"He's just a mistake my dad made. Why did Dad bring him here when he already has his own family?" She said frustratedly.
"Maybe because your Dad felt guilty for not being able to take care of him."
"What? He should be in the asylum!" She paused and lean towards her boyfriend before whispering to him.
"I saw him kill a dog last night. He was smiling the entire time while watching the dog struggling in his grip. I swear to god he's insane."
"I can't believe i'm related to someone like him! He needs help!"
"Okay okay calm down. Let's get out of here now." He told his girlfriend.
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[A/N] I don't play arcade games so i don't know what kinds of game arcades have...
"Ah ha! I won!" The guy said. "You haven't forgotten about the bet, have you?"
His girlfriend sighed. "Of course not. What do you want me to do?"
"That rich kid Kang Seulgi is in your class." He whispered to her. "I want you to make her fall in love with you."
The girl shook her head. "She has a girlfriend and she very loyal to her."
"That's why i want you to make her fall in love with you."
"That's impossible. Many students, both guys and girls, tried to seduce her but her heart didn't even waver once."
"Then...her cousin!" He said excitedly.
"That stupid Kim Yerim?" She said and he nodded his head.
"Yes."
"No problem, this will be fun..." She said with a grin on her face.
"But, if you fall in love with her too, you lose. And i'll tell Kim Yerim about this too. Because you're mine."
"Eyyy that will never happen."
[Sound of phone ringing]
"Sooyoung-ah! Where are you?" The girl's father asked her when she answered the call.
"I'm with Sungjae at the arcade. We'll be back soon. Bye." Sooyoung replied and ended the call. She's still mad at her father.
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Next day in school......
Sooyoung spotted Yerim with Seulgi and Wendy at the school gate.
