Yep, I don't know if the author had decided so from the start or not, but is extremely sick that they hid his real identity for so lonng and used him as labor.
Is a comic, but what if he had brain damage that could have made him lose his memories permanently or even die?
All because a jealous girl wanted him for herself.
MC is stupid too though, didn't go to a hospital or the police himself but stayed with a group of unknown people.
All and all we can just say, bad writing, could have been a far better story as no one covered female wresting in a manga before.