a trouble counselor is struggling to fix his collapsing marriage, but the uncertainty happened when the wife is adopted by a lunatic who claims is the rightful husband to the counselor wife.

To add fuel to the fire, what if the protag was a marriage counselor and this unstable gent was one of his clients.

"When a seemingly crazy man claims to be his wife's rightful husband, a troubled counselor must (Do this thing) if he's to save his collapsing marriage."