Blue Iris

They met secretly on the banks of the River Styx and made a promise to reincarnate together. Even if we could never see each other in love forever, she would have no regrets and he would have no regrets. After five reincarnations, they agreed to use iris to identify each other, but in the end they still couldn't enter each other's world. The three reincarnations all ended in tragedy, but he and she still had no regrets...