@yosef
Spoiler!
It's only a fragment, it's not the full memory. He won't remember that many detail, tho he still remember who yoojin is. And for the physical appearance, it's not like a different body suddenly popped out. It's just the memory, meanwhile the physical body is of the current hyunjae after the regression. Tho much much later in the chapter yoojin will meet the hyunjae before regression in a dungeon, the one that lost one eye and one arm, and no longer use chain as his weapon
V