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After finishing the main story of The Xianzhou Luofu inHonkai: Star Rail, you can embark on a journey to the fourth region called Penacony. The Reverie Reality will be the first area that you’ll unlock as soon as you land on this planet, but you won’t have the entirety of it unlocked from the start.
As you reach the third floor of the hotel where your room is supposed to be, you’ll find out that there are three locked rooms that you may’t enter just yet. However, you can open two of these by following certain quests.

First Door Unlock Process
you may only unlock the two doors on the left side during the Version 2.0 update. While you can unlock them in any order, the leftmost door is considered the firstsince you can get the quest to unlock it faster. For this one, you’ll have to find and start the Cosmic Star side quest. You need both The Reverie Reality and Golden Hour areas unlocked for it.
As you start doing this quest, you’ll meet a famous person who is supposed to be dead. He’ll ask you to check out his room in The Reverie Reality to find out the truth, and you’ll be able to enter this room during this part.You can find one of the 16 chests here, so you need to do this quest to complete your collection.

Second Door Unlock Process
The second and final door that you can unlock during the Version 2.0 updateis the one just beside the first one. For this, you’ll first have to continue the main story until you reach the Dream’s Edge area and reach the end of it with Firefly. Once you’re done with that part, you’llsee The Trees At Peace quest pop up on the northern side.
This quest takes you on a journey to the past of a genius' life, and even Screwllum and Herta get involved. You’ll unlock the second door when youreach The Reverie Reality with Screwllumand he uses his power to negotiate with the Bloodhound family.