Responses
uhh i dont know if its this one but it sounds similar to what ur saying
https://www.mangago.zone/read-manga/a_millennium_of_love/
Thank you, it's this
Can't remember this bl titled only remember that the ml has black hair glowing gold eye , (he's a snake ?)
Mc was send to the mansion (idk if it's a mansion) to undercover something.
Had very interesting art style.