One in a Heartbeat

What will you do if the person you hate and also you fell inlove with, Has a sickness that only you could heal. This is a story about lovey and Mikko's Painful love story. Every 6 PM Lovey must be with mikko to share a heartbeat or Mikko will have a hard time breathing. Lovey had a hard time dealing with him since he always bullies lovey in middle school but seeing him in pain was hard.
What will be the fate of these two lovers while Their lives is in hold?