I would move your Neogen essence treatment to before Klairs toner. It’s an FTE, and FTEs go before hydrating toners.
The DE glycolic serum is an active so it should go in your actives step, after cleansing and before FTE.
Melano CC is an active but it’s not a pH-dependant active (because it’s oil based) so some people use it in the actives step and some people use it in the serum step. It should work either way.
This is a good guide: https://www.fanserviced-b.com/a-visual-guide-to-the-korean-skincare-routine/