Intak is a mind reader since young, you're in the same class as him. He's invested in your daydreams, and he notices that after a couple of years, you start to think about him in a different light. He feels flustered at this and finds it interesting to tease you about it subtly.

Intak the mind reader x daydreaming you

Joshua and you have been bestfriends since childhood. You developed feelings for him over time, but it was one-sided and you gained a relatively common disease called Hanahaki disease, where you puke out flowers when the person you love doesn't love you back, the only way is to forget he exists and go to the doctor for it.

However he doesn't know and wants you to see him marry the love of his life, which is in a few months, where you may die.

"Will you come to my wedding?" Joshua asks you.

You have Hanahaki Disease, Joshua 
doesn't know.

Physical contact with your soulmate leads to the action of love blossoming in the heart to the development of vines around the two people's hearts and petals in the lungs.

When soulmates are separated or don't know they're soulmates, they cough up petals to full-blown flowers in intervals of weeks to months, depending on each immune system. When they begin to realise and fall in love, the symptoms of sickness disappear slowly. The denial of a soulmate leads to death. It is a rare soulmate bond.

(소울♡白翔) Hanahaki + Soulmates???

In this world, there are soulmates. You can only meet your soulmate when they touch you, and if they do, you find that you get a string attached to your finger.

So when you find that 
someone has touched your hand unconsciously and notice a red string, you get nervous, as for one, Intak had been the one to give your group flowers on stage last night and another, you were touching fans' hands.

You fall ill, as you're on hiatus, while the company tries to find your soulmate.

Soulmate with Intak, as he hands ur group flowers

Jiwoong is a vampire that has no control over his powers, when he meets a pure blood (you), he is able to control his powers. He meets you at the back of an alleyway behind the supermarket, and licks your cut.

When he meets you again at school as the student president of your class. He begs for your help of how he feels, looking vulnerable and you have no reason not to comply.

His powers are draining other humans of their life, and you are not affected by the draining.