To be fair the misunderstanding started with poor communications.
Despite that muscle maniac is mostly at fault by blackmailing him, but the wife persistently hiding the fact that his cousin which caused misunderstanding and seems act cold to him even his daughter too.
To make it worse the husband (the MC) is kinda coward and such a people pleaser, who can't tell or ask clearly what's going on even on his own wife.
Overall this is kinda weird for me, though it's funny in some occasions but still.. To a muscle obsessed girl clumsily like a married middle-aged guy without realizing, that what she did was trying to ruining his life with his family by blackmailed and stalked him.
The story is kinda ok, the art is good, not that bad though.