This is a story about an "accident". An illustrator who swore not to fall in love was couriered to the mountains and seas by the unreliable "Three Worlds Marriage Department", and met the nine-tailed fox fairy who topped the "Ten Thousand Years Single List". The two originally only wanted to cooperate on errands, but they walked into each other's lives unknowingly.
Unexpected express delivery, unexpected cohabitation, unexpected heartbeat. When the "number one who doesn't want to be in love" meets the "number one on the single list for ten thousand years", when an illustrator meets the fox fairy, when this life meets the past life... All accidents ultimately point to a destiny.
"It turns out that the Three Realms are not as big as you and me. The years are long, and I only want to spend them with you."