I fully understand Hyun. He's a person who have been obsessed with Youngjoon for years and Youngjoon was originally straight. He's insecure plus he can also feel that Jaejin likes youngjoon so the moment when he sees the two of them he gets paranoid. It's not bcoz he thinks that youngjoon doesn't like him but the difference of Hyun's years of love for him and Youngjoon only for a few months, there's bound to be insecurities, also Hyun's natural disposition is a possesive puppy like seme those types are the type that feels they've been abandoned rather than a type that gets psycho when there's a love rival(〜￣△￣)〜
I fully understand Hyun. He's a person who have been obsessed with Youngjoon for years and Youngjoon was originally straight. He's insecure plus he can also feel that Jaejin likes youngjoon so the moment when he sees the two of them he gets paranoid. It's not bcoz he thinks that youngjoon doesn't like him but the difference of Hyun's years of love for him and Youngjoon only for a few months, there's bound to be insecurities, also Hyun's natural disposition is a possesive puppy like seme those types are the type that feels they've been abandoned rather than a type that gets psycho when there's a love rival(〜￣△￣)〜