[Clarification about Scarlet Events]

I get lost about the new upcoming event!!
From the preview on the website they are talking about collecting those polished scale fragment in many ways:
Daily Challenge reward, Tower of Memory Daily quest and Daily login reward.
 

For tower of memory we get x3 polished scale fragment / Ok Good got it!
For daily login we get x3 polished scale fragment / Ok Good got it!
And for Daily challenge reward? I get lost in that part. #SendHelp
 

Quote

For completing Daily Challenge dungeons each day, you’ll receive 1 Dragon’s Bounty Reward Chest and 1 Dragonflame Jewel. Look below for the list of dungeons and rewards.

Isnt explained good at all.
I'm getting that Dragon Bounty Chest from completing two dungeon listed + one random than click on my Daily challenge reward and that's it?
I get it only from the quest/dynamic of the dungeon listed?
In these case, which dungeon gives the chest? I need to complete both of them? just one?
I receive x1 Dragon Bounty Chest each dungeon listed ?
Can i have a nice explain @Cyan please!