It hurts It hurts a lot for Chaeyoung to know that Jennie is the Golden Slytherin and she has to fight against her will if she does not want to betray the Mythical 7. She has to fight against her will if she wants to take the whole Slytherin down, but how can she fight if she is against the love of her life? 

Seunghoon might be her parter after Jennie left, but the broken promises and pieces of her heart cannot be replaced by him. Seunghoon was just a distraction for Chaeyoung, someone she used to forget about Jennie. She succeeds in her plan, forgetting everything about Jennie but all of those are temporary and it will not last forever 

FLASHBACK 

"Chaeyoung-ah!" 

"What?! Go away I hate you" 

"What did I even do to make you cry Chaeyoung?" 

"You made me look like an idiot waiting for you at the lake in the rain for three ing hours" 

"Chaeyoung! I'm sorry" 

"You should be" 

"Look, I'll make it up ok? Let's go home you're gonna get-" 

"I don't want to go home"

"Why? If we will stay here, then-"

"I want to stay here with you Jennie" 

"Chaeyoung, we might get sick"

"I don't care, just stay here with me. You said you're gonna make it