is this a sequel of origin of species??

No don’t think so it’s the Guy who Poisend the Mc from the Main Story ig that’s what people say in the comment

nope, not at all.
Mc&ML are side characters of origin of a species. ML appeared for the first time around chp 45^^ . so no, no kids of anyone its happaning either prior or around the same time- no major time skips. ML is a frenemie with OoAS ML. Mr Kwon and Mr Seo somewhat works together or not? im re reading now but The weirdo who drugged yoon isnt related to mr.Seo, maybe brother or cousin but this fucker definately isnt their son.