It’s a webtoon (I read it raw, so I don’t understand), the male mc with long black hair (and I think it’s reincarnation.?) because the setting is Rome-like, but sometimes mc remembering (like the past) as a Chinese or Korean soldier (I don’t know). In Rome-like, he’s some slave, but he don’t want to fight, but when his cell-mate almost attack by some big crocodile then he fought. Sometimes the fight was between slaves or slave vs some lion (or some other big animals).
I’m sorry, my English not so good, hope you understand
Goodness gracious, my cute baby boy has became hottie now