Blue Glass (2023)

Every princess in Nakrang Kingdom is fated to be married off as a political tool the moment she comes of age, and Princess Sol is no exception. Seeing her older sister die after being used the same way leaves her feeling alone and helpless. That is when a mysterious medium tells her that what she desires most awaits her outside the palace. As fate would have it, Sol finds a frail boy named Miru at the slave market and feels compelled to save him. Though Miru quickly becomes Sol's only refuge, it won't be easy to protect him from her evil brother's clutches... Source: TappyToon