After a recap of what we've seen so far in the animation, we see Soobin gasp as he snaps out back to reality same as in Eternally. It is highly likely that Soobin saw it all in his dream-vision once again.
After he picked up the dice, a portal leads him to what looks like, another memory from when they were little kids.
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As we get introduced to the little members, a dragon appears and tries to kidnap one of them who I believe, is Beomgyu since the one the dragon grabbed, had a book.
All the boys gather together and attack the dragon with magic, saving Beomgyu as we then can also see the star helping them out.
The boys are friends with the star and they had made a promise to stay together.
Another theory: Yeonjun d*ed from being possessed with magic from the dragon. As we see, the dragon is purple-colored, fires purple fire, and flies in a dark purple sky. Yeonjun’s neck cut is also purple. What if it's the magic, the dragon is trying to get back, that's why he won't leave the boys alone?🤔
The promise of staying together was broken when Yeonjun got the magic since now, he had different (dark) magic inside of him which eventually led him to his d*ath. Later on, he was revived with the spell book that Beomgyu has and Taehyun has the power to read and do the spells, but the nature balance is now broken, which makes them suffer. They can't be happy and stay together. So Yeonjun then asks help from the cat-shadow, to grand him powers to save and protect others, but the wish came with the price and Yeonjun then sacrifices himself for others' happiness.
(I'm sorry, I hope that makes sense--)
As Soobin comes back from the memories, another vision appears in front of him of other members.
