Since childhood, Do-kyung has been plagued by lingering spirits drawn to his strong yin energy—a curse that only worsens with age. Cornered by malicious ghosts, he's saved by Yoonje, a powerful spirit radiating yang energy. But Yoonje doesn't offer his help for free. "I'll share my energy with you if you share yours with me." Caught in an unusual pact, Do-kyung must navigate this strange exchange while fending off the feelings that begin to creep into his heart. Can their balance keep the darkness at bay? (Source: Lezhin Entertainment)