He only needs to spend 100 knowledge points to open any of the doors and complete the tasks inside.
However, there's a cooldown period between doors, they can't be opened consecutively without a gap.
As for the later part of the story, everyone knows it.
The first door leads to the 1665 dungeon.
The activation points for this dungeon were gifted by Halo, where Xu Yun met Little Niu and completed the novice task.
The second door is the 1100 dungeon.
Time of the Northern Song, Xu Yun caused a major event.
The third door is unknown and not yet ready to be opened.
Another thing worth mentioning.
Before opening the second door, Xu Yun gained 107 knowledge points through cockroach extermination live streaming.
At the time, the allocation of 107 knowledge points was: the 1665 dungeon received seven points, making it '10/100.'
The 1100 dungeon received 100 points, thereby unlocking that tale of the Northern Song.
Later, the Northern Song dungeon ended.
