Since childhood, 'Taejun' has the ability to see a person's unique aura whenever they come in contact with him. With this ability, he was able to link up people who have the same aura color and became known as the 'Sales Department Cupid' in the company he's working in. However, a newcomer named Hongyeon who has a rainbow-colored aura, suddenly started to get closer with him... Can Taejun handle this extraordinary guy?