This story is a combination of two distinct story types commonly found on Webnovel. First off the mistreated married mercenary king. In this case we have the MC who transmigrated into a situation where he had a one night stand with this 'noble' girl from one of the noble families. It left a bad situation for the girl, while the MC was thrown onto a prison island to rot. There he found a grand opportunity and before he leaves to return 'home' he acquires the 'assets' of all the other prisoners on paper. Of course they do not believe he can utilize them as he is also one of the prisoners. But then he says goodbye and successful leaves. The second story type is the daddy/daughter story. The MC was not aware of this daughter and the time-frame also does not seem to quite line up, but the girl is very much drawn to him, and also looks a lot like him. The actual situation for this story is that the female has been very much mistreated by her family and the MC is not one of those guys who is going to hide his power and ability. He is going to go right out and deal with problems not hiding who and what he is. Finally the MC is not really all that faithful the the noble girl, though he does seem like he is going to be very faithful to his daughter. The MC is a shrewd guy who goes after what he is interested in, yet has enough self belief that he has no interest in forcing others into sexual relationships with him. He is pursuing those he want, yet is very pragmatic. There are two fantastical events in the story so far. One is the MC getting the technique that provides all of his powers and abilities, which we only get a very brief memo of the event occurring, the other is where the MC leaves the island and just so happens to come across a cruise ship that his girl and daughter are on.
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LIKEahhh Yes the son in law I have seen 11 of those that are copy paste of one another.
RightLeaningRLL:Very common cliche in "live in son-in-law" stories. "Johnny X came back from being the god of war, only to find his wife and daughter being mistreated by her family" or variations of such.