where to watch vivant?

Hello there!

You can find it for free online, of course. 

For the Vivant episodes,

• You can download them as torrents from Nyaa.si. A group called [MagicStar] is currently releasing the episodes, you can find them here, https://nyaa.si/?f=0&c=0_0&q=vivant
• Or, you could download the files directly through dramahd.me, but watch out for the ad popups! https://dramahd.me/vivant-2023/

As for the subtitles if you need them, you can download English subtitle files separately:

• A fansub group called Sars-Fansubs has picked up Vivant for English subbing, subtitles will be made available on their free site Drama-Otaku (DO). You can register on DO for free, and the registration is usually open on Fridays and Saturdays.
  https://twitter.com/sarsfansubs/status/1686320428959289345
  https://drama-otaku.com/help/
• English subtitles are also being made available by "pekochan05" on Subscene, free to download,
  https://subscene.com/subtitles/vivant 

If you have any more questions, I'll be happy to help :)