Transmigrated as an Ignored Crown Princess

After weeping himself to sleep from a broken heart, the gentle and carefree Yamato never expected to wake up in a body of an ignored wife on ancient time. In a world he knows no one in, Yamato got a cold tyrant as a husband, an innocent medicine peddler as the mistress, and a super cute twin little bun as sister and brother-in-law. He have the slightest clue to go back to his former world and body. But given the carefree man he is, bidding his time while playing with the buns does not sound too bad.