"I'm trying to live my life without you." Book 2 of the soulmates series

"So you're telling me, my soulmate is an idol?" Book 1 of the soulmate series

Kim Ah Reum, a girl with heart disease falls in love with a guy she meets in the hospital. Yang Jungwon, a sweet and caring person. But she doesn't want him to know that she's in love with him. She couldn't live longer. She couldn't hurt Jungwon that way. "Loving me must be so hard right? I'm sorry."

A girl named Choi Aera became a friend with someone she met at the hospital. She fell in love with him but he suddenly disappeared into thin air.