https://www.dlsite.com/comic/work/=/product_id/BJ181464.html
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I'm selling my wife's secret.

Wife's secrets taste like honey....
At first, it was for money...but...what is this lust that arises from the search for secrets?
I want to know the wife I don't know...I want to know the wife I don't know...Kazuto had no choice but to rely on black market money to pay his debts without telling his wife or his workplace.
One day, he is offered an even better money-making deal.
What was it? It was to "sell his wife's secrets"....
Kazuto thought that only an earnest wife would keep secrets.
But after discovering a trivial secret, he suddenly finds his wife's secrecy fascinating....
If my wife is cheating on me.......my perverted and degrading feelings escalate my surveillance, and finally....
I trust my wife... so tell me everything...

Chinese version: https://e-hentai.org/g/2588944/a3035d7606/
English Webtoon version (ch.1-24): https://e-hentai.org/g/1680787/8932b2a0fa/