Scale worm/Syllid worm? (Syllidae/Polynoidae) 염주발갯지렁이-류인가,,비늘갯지렁이-류인가

,,Encountered by observing marine plankton using fishing light in the surface layer
Ulsan,,Korea ,,early November,,2023
size: ca.4mmTL,,
00:00-00:15 black background +high light
00:16-00:26 black background +low light
00:27-00:37 white background