For Black Gold, gold is his world.
He wants to protect Jin and solve everything for him when Jin is unhappy.
He is like a puppet and a shadow.
I leave the light to you, and I manage the darkness.
You just need to smile in the sun and I will protect you.
I have nothing to fear for you. The author has something to say: 1. There are many private settings. (Hei Jin has an independent consciousness.) 2. The plot is all nonsense. 3. I will try my best to maintain my personality!