One lives a carefree lifestyle roaming around the world. The other places his reason over his heart, after weathering thousands of hardships. Their relationship, which simply began as "having fun while it lasts", gradually evolves into a bloodless psychological battle. While suspicion and mutual intrigue escalate into warfare as they relentlessly challenge each other’s bottom-line, their emotions unknowingly build until they are helplessly entangled together. The one who cares more is also the one who is more affected by the presence of the other.