Sunwoo has a crush on Giwook and he always feels this twinge of jealousy whenever Dongmyeong is around that he can't explain. It isn't until Dongmyeong makes a move on Sunwoo that Sunwoo realizes it's not jealousy; he's into both Giwook and Dongmyeong. 

Strenght grows in the moments when you think you can't go on but you keep going anyway. I wish I could take your pain away.

'Once upon a time, a kingdom dwelled deep within the forest. Hidden behind a curtain of gilded leaves and trees, was a palace of silver and gold. Inside the palace, lived a king and a queen with their beloved son as they ruled the land with benevolence and grace and all was well. But everything changed when greed corrupted the people and they attacked the palace by morning. Soldiers slain, royal blood spill

Eric has a thing for Sunwoo's dad Sangyeon. Sangyeon has a thing for Sunwoo's best friend Eric. Sunwoo completely endorses the idea of them being together so Sunwoo does what Sunwoo does best: meddle. or Eric and Sangyeon like each other but won't say anything and Sunwoo just wants them to kiss.

Changmin goes to practice with a cough. It blossoms into something much more than he expected. Pain, sickness and bucket-loads of bright red tulips, all for one person. Kim Sunwoo. - A Sunkyu Hanahaki Disease AU