[World Obsession Complete Collection Short Story Anthology] One or Not

'''Introduction to the Work: Dragon Calix, who possessed an immortal heart and lived an eternal life, one day had half of his heart forcibly taken by the imperial family. To reclaim his own heart, which had been shrunken to fit the body of the young Crown Prince Serion, he kidnaps and raises the prince. But, is it a side effect of the half-heart? Serion's obsession with Calix grows deeper by the day... The timeless romance of two races sharing one heart, <One or Not>.'''