After killing Muzan, Tanjiro became the only ghost king in the world who was not afraid of the sun, and traveled back to Muzan's era.
Tanjiro originally wanted to kill Muzan before he became a ghost and became the King of Ghosts, but he relented.
This soft-hearted, he fell into it.
No tragedy copywriting:
When Wu Kai was a child, he met a person and he fell in love with that person at first sight.
When he grew up, during his most painful days, that person appeared.
That person has been in love with him for a long time.
But one day, the man disappeared.
Wu Ke went crazy.
Turn that person into the only one - winding zero.
Purpose: Tanjiro Tan