Is the LG 43PK340S a regular TV?

No. It is a commercial signage display running webOS signage software. It lacks a broadcast tuner and the usual consumer streaming setup, so it suits scheduled business content, not casual channel surfing.

Can I play my own videos and images on it?

Yes. webOS signage supports playlists and scheduled playback from USB storage or a network, so you can loop menus, promos or information slides without a separate media player.

Yes, HDR is supported. That helps contrast with compatible content, though the panel's brightness is modest compared with premium consumer TVs.

Can I manage several screens remotely?

LG's webOS signage tools allow remote content and schedule management over a network. That makes it practical for multi-screen setups in shops or offices.

Is it good for a bedroom or living room?

It works as a display, but a consumer 4K TV at the same size offers tuners, more apps and better sound for home use. Choose this only if signage features matter to you.