Possible fail marriage/cheating/smut/mature

Jahyun wanted to marry Garan, but the king forced him to marry Soru as his legal wife instead, Jahyun reluctantly agreed, but he treated Soru like shit, after a while, he married Garan and happily slept with his concubine multi times (there were detailed snu snu scenes of those two). Soru did have feelings for Jahyun, but she lost her memories, then she developed a romance with Yato (who was just an imposter, he wasn't Soru's father). Soru and Yato ended up together. Jahyun spent the rest of his

Cheated husband not the ml thou