The bright red flame-like color is the color of the phoenix. And the flaming red fox under the peach tree will eventually sink into this mortal world.
The fox who transformed into a young man in red was eventually caught in a fire disaster and left gasping for breath, suffering from a mental disorder that never healed.
Dark blue is the color of the night sky, the color of the night. And the young man in blue under the willow tree will eventually be entangled in sinful feelings. Destined to be stubborn and embark on a thorny road.
But only foolish people will mix too much blood-and-heart desire into their feelings.