Scenario: After a huge argument the two of you broke up but later on you regretted it deeply and decided to go back to him.
Yeonjun:
He would be confused at first not knowing how to feel. He is deeply in love with you and the thought of going back to you made him happy but at the same time he would be still mad at you.
He would act distant and cold at first but then after a while, after he makes sure you won't hurt him again, he would start dating you, everything will start again from zero but once, he will be extra cautious. A precious baby.
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Soobin:
This can either go two ways.
The first way where you will genuinely apologize to him and he would take some time, not too long, to make up his mind and end up forgiving you.
The other way is too cruel, we all know how Soobin deals with haters, and he won't let anyone trigger him off. He might indirectly insult you saying that you broke up with a prince and that it is too late to fix everything since you wasted your chance.
He won't be very understanding since you broke his heart once, and he won't let you do it twice.
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Beomgyu:
Happy, very very happy. But nevertheless, he won't EVER show it to you. He would act cold and as if he is interested in someone else just to trigger you off until you start growing distant and then he would quickly hold you and apologize.