When Makoto’s boyfriend ran away with her money and she was fired from her job, she thought her luck was over. That is, until she fell into the ocean while drunk and was rescued by a charming, rich and older man who decides to mold her into a perfect lady to marry! However, for the ordinary Makoto this proves difficult and she soon finds herself in bed with Aito, a rebellious teen… and unbeknownst to her, the son of her fiancée! Now that the three of them are living in the same house, Makoto finds her heart in turmoil. Who will she choose to love?
The monarchy was abolished long ago in Korea – but what if it still existed to this day? Chae-Kyung lives in such a world where Korea’s palaces are filled with royalty and the crown prince Shin has transferred into her school. Her initial run-in with the boy is unpleasant to say the least; but what’s worse, Chae-Kyung soon discovers that she and Shin are forced to be married due to a promise their grandparents made! How can a simple commoner learn to live the life of a princess when she can’t stand her newly beloved husband?
Candy Life has more sexual content and is more mature in general, but both it and Goong involve a girl who's stuck in a relationship she'd rather not be in - at least she thinks. There's a love triangle as well (more so in Candy Life).
In the year 1580 in feudal Japan, Fifteen-year-old Usagi is a klutz of a ninja who can't seem to complete her training. As she's unfit to be a ninja her great grandfather sends Usagi to Segachi on a very special mission: to marry the skilled ninja Hanzo Hattori and bear his child! However, there's a problem: Hanzo has no desire to be married. Usagi is allowed to stay with Hanzo for one year in order to complete her training, during which she tries her hardest to catch his eye. But lovely rivals such as Yuri and the Princess Sara, and love triangles with childhood friends and others stand in the way of true romance. Will Usagi ever end up with her beloved Hanzo?
Though Candy Life and Tail of the Moon have different demographics (josei vs shoujo, respectively) and thus have a difference in mature elements and sexual material, I think both are decent recs for each other. Each involves a girl who must try to fit the perfect role of someone she is not (a ninja and a 'lady'), with plenty of romance and love triangles abounding.