Starmer is about as left headed as a straight line railway across Australia. Corbyn was left (maybe).
cf. https://www.politicalcompass.org/uk2024
Even if you consider that page biased in whatever way - it's still useful for comparisons on the same scale. E.g. https://www.politicalcompass.org/norway2025
he is objectively left wing. People are over indexing on his controversies instead of looking at his policy platform as a whole. Also take into account that he is in a democracy the leans right on many un-impactful but hot topic issues.
Starmer is a Fabian. He is textbook, self identified left and socialist. He is pretty much a poster child for leftism.
> Corbyn was left (maybe).
Corbyn was (is?) a Castro-sympathizing communist. If you classify him as "left (maybe)", then I don't even want to ask what is "left" to you.
Guy is all over this post commenting nonsense because he's in love with the party that instated martial law recently and tried to do a coup. You're wasting your time on him.
You're completely right that the Korean blues are anything but left. Not even just compared to Corbyn, even compared to European labor parties (the champagne "social democrats" in each country). Biden was more left-wing than the Korean blues. That tells you everything.
In many ways the Korean blues are more nationalist than the reds, which can't be said about basically any modern relevant left-wing party elsewhere. Another good indicator they're absolutely not left-wing.