should I read this? Is the ml toxic?

not toxic at all

(Spoilers ahead , sorry.)

Tbh, this is like the ONLY Manga you'll read where neither the male lead, or the female lead are toxic. Neither are possessive, or assholes. And well he might see! Like he's toxic with the whole revenge murder of the entire empire.

He's not, he was taking revenge on the kingdom who killed his childhood lover / Current new wife. Who he was supposed to protect. ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄

Its a good read, definitely should read it!